diff --git a/Documents/proto/general/openapi.yaml b/Documents/proto/general/openapi.yaml
index 187f3d3..4b8df80 100644
--- a/Documents/proto/general/openapi.yaml
+++ b/Documents/proto/general/openapi.yaml
@@ -122,11 +122,11 @@ paths:
           description: Successfully changed. 
         '401':
           $ref: '#/components/responses/UnauthorizedError'
-  /user/{mat}:
+  /user/{RegNo}:
     parameters:
-      - name: mat
+      - name: RegNo
         in: path
-        description: Matricule of the user (unique id)
+        description: Regestration number of the user (unique id)
         required: true
         schema:
           type: integer
@@ -147,6 +147,8 @@ paths:
       tags:
         - General
         - Admin
+        - Secretariat
+        - Ext (scientific articles)
       security:
         - bearer: []
       requestBody:
@@ -188,6 +190,12 @@ paths:
         '401':
           $ref: '#/components/responses/UnauthorizedError'
   /courses/{id}:
+    parameters:
+      - name: id
+        in: path
+        required: true
+        schema:
+          type: integer
     get:
       summary: see courses informations 
       tags:
@@ -200,12 +208,7 @@ paths:
             application/json:
               schema:
                 $ref: '#/components/schemas/Course'
-    parameters:
-      - name: id
-        in: path
-        required: true
-        schema:
-          type: integer
+
     delete:
       summary: delete a course 
       tags:
@@ -265,7 +268,7 @@ paths:
       summary: Create a cursus
       tags:
         - General
-        - cursus
+        - Cursus
       security: 
         - bearer: []
       requestBody:
@@ -297,7 +300,7 @@ paths:
       summary: See Cursus's informations 
       tags:
         - General
-        - cursus
+        - Cursus
       responses:
         '200':
           description: OK
@@ -315,7 +318,7 @@ paths:
       summary: Delete cursus
       tags:
         - General
-        - cursus
+        - Cursus
       security: 
         - bearer: []
       responses:
@@ -327,7 +330,7 @@ paths:
       summary: Modify cursus 
       tags:
         - General
-        - cursus
+        - Cursus
       security:
         - bearer: []
       requestBody:
@@ -363,9 +366,10 @@ paths:
         '401':
           $ref: '#/components/responses/UnauthorizedError'
           
+             
   /lesson:
     post:
-      summary: Create a new lesson
+      summary: create a new lesson
       tags:
         - Secretariat
         - Lesson
@@ -604,7 +608,174 @@ paths:
       responses:
         '201':
           description: Display modified
-    
+ # Extension publication scientifique 
+
+  /article:
+    post:
+      summary: create an article
+      tags:
+        - Ext (scientific articles)
+        - Researcher
+      security:
+        - bearer : []
+      responses:
+        "201" : 
+          description: OK
+        '401':
+          $ref: '#/components/responses/UnauthorizedError'
+      requestBody:
+        required : true
+        content: 
+          application/json:
+            schema:
+              type: object
+              properties:
+                pdf:
+                  type: string 
+                  description : the B64 version encoding of the pdf file
+                access:
+                  type: string
+                summary:
+                  type: string
+                language:
+                  type: string
+                title:
+                  type: string
+                date:
+                  type: string
+                  description: Follow the iso 8601 ("YYYY-MM-DD")
+                views:
+                  type: integer 
+            example:
+                    {
+        "access": "private",
+        "pdf": " *the b64 encoding of the pdf* ",
+        "summary": "looks in details about graph's second theorem",
+        "language": "english",
+        "title": "graph's second theorem study",
+        "date":"2023-02-01",
+        "views": 420,
+        "authors" : []
+        }
+  /article/{id}:
+    parameters:
+      - name: id
+        in: path
+        required: true
+        schema:
+          type: integer
+    get:
+      summary: get a certain article
+      tags:
+        - Users
+        - Ext (scientific articles)
+      security:
+        - bearer: []
+      responses:
+        "201": 
+          description: OK
+          content:  
+            application/json:
+                schema:
+                  $ref: '#/components/schemas/Article'
+        '401':
+          $ref: '#/components/responses/UnauthorizedError'
+          
+    patch:
+      summary: modify an article
+      tags:
+        - Researcher
+        - Ext (scientific articles)
+      security:
+        - bearer : []
+      responses:
+        "201": 
+          description: article modifié
+        '401':
+          $ref: '#/components/responses/UnauthorizedError'
+      requestBody:
+        required : true
+        content: 
+          application/json:
+            schema:
+              type: object
+              properties:
+                pdf:
+                  type: string 
+                  description : the B64 version encoding of the pdf file
+                access:
+                  type: string
+                summary:
+                  type: string
+                language:
+                  type: string
+                title:
+                  type: string
+                date:
+                  type: string
+                  description: Follow the iso 8601 ("YYYY-MM-DD")
+                views:
+                  type: integer
+              example:
+                                  {
+        "access": "public",
+        "pdf": " *the new b64 encoding of the pdf* ",
+        "summary": "looks in details about the duck's algorithm problem",
+        "language": "english",
+        "title": "duck's algorithm problem solving",
+        "date":"2023-02-01",
+        "views": 10,
+        "authors" : []
+        }
+              
+
+    delete:
+      summary: delete own article
+      tags:
+        - Researcher
+        - Ext (scientific articles)
+      security: 
+        - bearer: []
+      responses:
+        '201':
+          description: OK
+        '401':
+          $ref: '#/components/responses/UnauthorizedError'
+      
+  /DisplayArticle:
+      parameters:
+        - in: query
+          name: author
+          required: false 
+          schema:
+            type: string
+        - in: query
+          name: access
+          required: false 
+          schema:
+            type: string
+            enum: [public, restricted, private]
+        - in: query
+          name: name
+          required: false 
+          schema:
+            type: string
+            
+      get:
+        summary: get a list of article's data
+        tags:
+          - Users
+          - Ext (scientific articles)
+        responses: 
+          '200':
+            description: OK
+            content: 
+              application/json:
+                schema:
+                  type: array
+                  items:
+                    $ref: "#/components/schemas/DisplayArticle"
+
 components:
   securitySchemes:
     bearer:
@@ -698,6 +869,66 @@ components:
         "id": 42,
         "courses": ['Math', 'Info']
         }
+    Article:
+      type: object
+      properties:
+        articleId: 
+          type: integer
+        access :
+          type : string
+        pdf :
+          type : string
+          description : file location
+        summary:
+          type : string
+        language:
+          type : string
+        title :
+          type : string 
+        date: 
+          type : string
+        views :
+          type : integer
+        authors:
+          type: array
+          items:
+            $ref: '#/components/schemas/User'
+          description: first user is the author, the remaining users are co-authors
+      example:
+        {
+        "articleId": 42,
+        "access": "private",
+        "pdf": "/articles/42",
+        "summary": "looks in details about graph's second theorem",
+        "language": "english",
+        "title": "graph's second theorem study",
+        "date":"2023-02-01",
+        "views": 420,
+        "authors" : []
+        }
+    DisplayArticle:   
+      type: object
+      properties:
+        articleId: 
+          type: integer
+        access:
+          type: string
+        summary:
+          type: string
+        title:
+          type: string 
+        author:
+          type: string
+          items:
+            $ref: '#/components/schemas/User'
+      example:
+        {
+        "articleId": 42,
+        "access": "private",
+        "summary": "looks in details about graph's second theorem",
+        "title": "graph's second theorem study",
+        "author" : "john doe"
+        }
     Lesson :
       type: object
       properties:
@@ -773,3 +1004,7 @@ components:
   responses:
     UnauthorizedError:
       description: Unauthorized access or missing bearer 
+
+
+
+