diff --git a/sourcing/model.py b/sourcing/model.py
index 71f5e72..6281185 100644
--- a/sourcing/model.py
+++ b/sourcing/model.py
@@ -127,9 +127,6 @@ class Reference(Base):
     subject_id = Column(Integer, ForeignKey('item.id'), primary_key=True)
     object_id = Column(Integer, ForeignKey('item.id'), primary_key=True)
 
-    subject_item = relationship('User', backref='objects')
-    object_item = relationship('User', backref='subjects')
-
 class Item(TimeStampedModel):
     __tablename__ = 'item'
     __versioned__ = {'base_classes': (TimeStampedModel,)}
@@ -142,15 +139,14 @@ class Item(TimeStampedModel):
     filename = Column(Unicode)
     text = Column(UnicodeText)
 
-    subjects = relationship('item',
+    subjects = relationship('Item',
                             secondary='reference',
-                            # backref='object_item',
-                            primaryjoin=id == Reference.object_id)
-    objects = relationship('item',
+                            backref='object_item',
+                           foreign_keys=Reference.subject_id)
+    objects = relationship('Item',
                            secondary='reference',
-                           # backref='subjects_item',
-                           primaryjoin=id == Reference.subject_id)
-
+                           backref='subjects_item',
+                           foreign_keys=Reference.object_id)
     user = relationship('User', backref='items')
 
     __mapper_args__ = {