diff --git a/YACOSCore/ejbModule/org/yacos/core/users/IUserManager.java b/YACOSCore/ejbModule/org/yacos/core/users/IUserManager.java
index d178abb..f07edce 100644
--- a/YACOSCore/ejbModule/org/yacos/core/users/IUserManager.java
+++ b/YACOSCore/ejbModule/org/yacos/core/users/IUserManager.java
@@ -4,13 +4,14 @@ import java.util.List;
 
 import javax.ejb.Remote;
 
+import org.yacos.core.conferences.Conference;
 import org.yacos.core.exceptions.PKAlreadyUsedException;
 
 @Remote
 public interface IUserManager {
 	
 	//crud methode
-	public List<User> getUsers();
+	
 	public User addUser(String login, String password, String firstName,
 			String lastName, String organization, String email) throws PKAlreadyUsedException;
 	public void removeUser(User user);
@@ -18,8 +19,10 @@ public interface IUserManager {
 	public void UpdateUser(User user);
 	public Boolean exists(String login);
 
-	//role methode
-	public List<Role> getRoles();
+	// methodes lister
+	public List<User> getUsers();
+	public List<User> getUsers(Conference conf);
+	public List<User> getUsers(Role.RoleType type);
 	
 		
 }
diff --git a/YACOSCore/ejbModule/org/yacos/core/users/User.java b/YACOSCore/ejbModule/org/yacos/core/users/User.java
index 7a041c0..40e4d5d 100644
--- a/YACOSCore/ejbModule/org/yacos/core/users/User.java
+++ b/YACOSCore/ejbModule/org/yacos/core/users/User.java
@@ -9,6 +9,7 @@ import javax.persistence.Entity;
 import javax.persistence.Id;
 import javax.persistence.OneToMany;
 
+import org.yacos.core.article.Article;
 import org.yacos.core.conferences.Conference;
 
 
@@ -52,12 +53,16 @@ public class User implements Serializable{
 	 * Active email (has to be used frequently) of the user
 	 */
 	private String email;
+	
 	/**
 	 * Roles for this user
 	 */
 	@OneToMany(targetEntity=Role.class,mappedBy="user")
 	private List<Role> roles;
 	
+	@OneToMany(targetEntity=Article.class,mappedBy="mainAuthor")
+	private List<Article> articles;
+	
 	public User(String login, String password, String firstName,
 			String lastName, String organization, String email) {
 		this();
@@ -159,5 +164,15 @@ public class User implements Serializable{
 	public void setRoles(List<Role> roles) {
 		this.roles = roles;
 	}
+
+	@OneToMany(targetEntity=Article.class,mappedBy="mainAuthor")
+	public List<Article> getArticles() {
+		return articles;
+	}
+
+	@OneToMany(targetEntity=Article.class,mappedBy="mainAuthor")
+	public void setArticles(List<Article> articles) {
+		this.articles = articles;
+	}
 	
 }