Authors Year Title
Becker, Aboussalam & Bockwinkel 2004 The Givetian and Frasnian at Oued Mzerreb (Tata region, eastern Dra Valley). - [T.R. Becker, S.Z.Aboussalam, J.Bockwinkel, V. Ebbighausen, A. El Hassani & H.NĂ¼bel]
Devonian Neritic-Pelagic correlation and events in the Dra Valley (Western Anti-Atlas, Morocco,  A. El Hassani, ed., Docum.Inst.Scient., 19: 29-43, 1 pl., 4 fig., 2 tab.,Rabat.
Ebbighausen, Becker & Bockwinkel 2007 Givetian (Middle Devonian) brachiopod-goniatite-correlation in the Dra Valley (Anti-Atlas, Morocco) and Bergisch Gladbach-Paffrath Syncline (Rhenish Massif, Germany). [V.Ebbighausen,R.T.Becker,J.Bockwinkel & Z.S.Aboussalam].
Geological Society,London,Special Publications, 278_ 157-172, 9 fig., 1 tab., London.