diff --git a/YACOSCore/ejbModule/org/yacos/core/article/Article.java b/YACOSCore/ejbModule/org/yacos/core/article/Article.java
index 519ad57..c444a97 100644
--- a/YACOSCore/ejbModule/org/yacos/core/article/Article.java
+++ b/YACOSCore/ejbModule/org/yacos/core/article/Article.java
@@ -32,7 +32,11 @@ public class Article implements Serializable {
 	private String title;
 	private String topic;
 	private String URL_article;
-	private String mainAuthor;
+	
+	//@ManyToOne(targetEntity=Conference.class)
+	//@JoinColumn(name="mainAuthor",nullable=false)
+	private User mainAuthor;
+	
 	private ArrayList<String> secondaryAuthors;
 	
 	/**
@@ -77,9 +81,9 @@ public class Article implements Serializable {
 		secondaryAuthors = new ArrayList<String>();
 	}
 
-	public Article(int reference, String title, String topic,
-			String url_article, String mainAuthor,
-			List<String> secondaryAuthor, int state) {
+	public Article(String title, String topic,
+			String url_article, User mainAuthor,
+			List<String> secondaryAuthor, int state, Conference conference) {
 		//this.id = reference;
 		this.title = title;
 		this.topic = topic;
@@ -93,6 +97,7 @@ public class Article implements Serializable {
 		this.state = state;
 		referees = new ArrayList<User>();
 		pcMembers = new ArrayList<User>();
+		this.conference = conference;
 	}
 
 	@Id
@@ -129,11 +134,15 @@ public class Article implements Serializable {
 		URL_article = url_article;
 	}
 
-	public String getMainAuthor() {
+	@ManyToOne(targetEntity=User.class)
+	@JoinColumn(name="mainAuthor",nullable=false)
+	public User getMainAuthor() {
 		return mainAuthor;
 	}
 
-	public void setMainAuthor(String mainAuthor) {
+	@ManyToOne(targetEntity=User.class)
+	@JoinColumn(name="mainAuthor",nullable=false)
+	public void setMainAuthor(User mainAuthor) {
 		this.mainAuthor = mainAuthor;
 	}
 
@@ -213,13 +222,13 @@ public class Article implements Serializable {
 			}
 		}
 	}
-	
 	@ManyToOne(targetEntity=Conference.class)
+	@JoinColumn(name="conference_id",nullable=false)
 	public Conference getConference(){
 		return conference;
 	}
-	
 	@ManyToOne(targetEntity=Conference.class)
+	@JoinColumn(name="conference_id",nullable=false)
 	public void setConference(Conference conference){
 		this.conference = conference;
 	}
diff --git a/YACOSCore/ejbModule/org/yacos/core/article/ArticleManagerBean.java b/YACOSCore/ejbModule/org/yacos/core/article/ArticleManagerBean.java
index 3fd830a..2d29ad2 100644
--- a/YACOSCore/ejbModule/org/yacos/core/article/ArticleManagerBean.java
+++ b/YACOSCore/ejbModule/org/yacos/core/article/ArticleManagerBean.java
@@ -7,8 +7,9 @@ import javax.ejb.Stateless;
 import javax.persistence.EntityManager;
 import javax.persistence.NoResultException;
 import javax.persistence.PersistenceContext;
+import javax.persistence.Query;
 
-
+import org.yacos.core.conferences.Conference;
 import org.yacos.core.users.User;
 
 @Stateless
@@ -26,18 +27,13 @@ public class ArticleManagerBean implements IArticleManager, Serializable {
 		
 	}
 
-	public Article addArticle(int reference, String title, String topic,String url_article, 
-			String mainAuthor, List<String> secondaryAuthor, int state) {
-		Article a = new Article(reference, title, topic, url_article, mainAuthor, secondaryAuthor, state);
+	public Article addArticle(String title, String topic,String url_article, 
+			User mainAuthor, List<String> secondaryAuthor, int state,Conference conference) {
+		Article a = new Article(title, topic, url_article, mainAuthor, secondaryAuthor, state, conference);
 		em.persist(a);
 		return a;
 	}
 
-	@SuppressWarnings("unchecked")
-	public List<Article> getArticles() {
-		return em.createQuery("from Article a ORDER BY a.title").getResultList();
-	}
-
 	public void updateArticle(Article article) {
 		em.merge(article);
 		
@@ -52,6 +48,26 @@ public class ArticleManagerBean implements IArticleManager, Serializable {
 		return em.find(Article.class, id);
 	}
 	
+	@SuppressWarnings("unchecked")
+	public List<Article> getArticles(Conference conf) {
+		Query query = em.createQuery("from Article a WHERE conference = ? ORDER BY a.title");
+		query.setParameter(1, conf);
+		return query.getResultList();
+	}
+
+	@SuppressWarnings("unchecked")
+	public List<Article> getArticleOfAuthor(Conference conf, User author) {
+		Query query = em.createQuery("from Article a WHERE conference = ? and mainAuthor = ? ORDER BY a.title");
+		query.setParameter(1, conf);
+		query.setParameter(2, author);
+		return query.getResultList();
+	}
+
+	public List<Article> getArticlesOfMember(Conference conf, User member){
+		//TODO
+		return null;
+	}
+	
 	public void assignArticleToPCMember(Article article,User pcMember){
 		article.assignToPCMember(pcMember);
 		em.flush();
diff --git a/YACOSCore/ejbModule/org/yacos/core/article/IArticleManager.java b/YACOSCore/ejbModule/org/yacos/core/article/IArticleManager.java
index 3250dd1..9f3f89a 100644
--- a/YACOSCore/ejbModule/org/yacos/core/article/IArticleManager.java
+++ b/YACOSCore/ejbModule/org/yacos/core/article/IArticleManager.java
@@ -1,27 +1,42 @@
 package org.yacos.core.article;
 
 import java.util.List;
+
 import javax.ejb.Remote;
 
+import org.yacos.core.conferences.Conference;
+import org.yacos.core.users.User;
+
 
 @Remote
 public interface IArticleManager {
 	public Article getArticle(Integer id);
-	public Article addArticle(int reference, String title, String topic,String url_article, 
-			String mainAuthor, List<String> secondaryAuthor, int state);
+	public Article addArticle(String title, String topic,String url_article, 
+			User mainAuthor, List<String> secondaryAuthor, int state,Conference conference);
 	public void removeArticle(Article a);
 	public void updateArticle(Article article);
-	public List<Article> getArticles();
 	
 	
+	
+	//liste d'articles
+	
+	//public List<Article> getArticles();
+	public List<Article> getArticles(Conference conf);
+	public List<Article> getArticleOfAuthor(Conference conf, User Author);
+	public List<Article> getArticlesOfMember(Conference conf, User member);
+	
+	//FIXME a déplacer dans user??
 	public List<?> getArticlePCMembers(Article article);
 	public List<?> getArticleReferees(Article article);
+	
+	
 	public Preference getArticlePreferenceForUser(Integer article_id, String pcMemberLogin);
 	public void setArticlePreferences(Article article, List<Preference> preferences);
 	public void addArticlePreference(Integer article_id, String userLogin, String preferenceValue);
 	public void addOrUpdatePreference(Integer article_id, String userLogin, String preferenceValue);
+	
+	//FIXME interet ?
 	public boolean existsArticle(Article article);
 	public boolean existsPreference(Preference preference);
-	
 		
 }