Geyer, G., Heldmaier, W., Landing, E., 1995. Arthropod Traces in the Middle Cambrian of Morocco, in: Geyer, G., Landing, E. (Eds.), Morocco '95-The Lower-Middle Cambrian Standard Of Western Gondwana. Beringeria, p. 254.

Geyer, G., Landing, E., 1995. The Cambrian of the Moroccan Atlas Regions, in: Geyer, G., Landing, E. (Eds.), Morocco '95-The Lower-Middle Cambrian Standard Of Western Gondwana. Beringia, pp. 7-46.

Geyer, G., Landing, E., Heldmaier, W., 1995. Faunas and Depositional Environments of the Cambrian of the Moroccan Atlas Regions, in: Geyer, G., Landing, E. (Eds.), Morocco '95-The Lower-Middle Cambrian Standard Of Western Gondwana. Beringeria, pp. 47-120.

Geyer, G., Landing, E., 1995. MOROCCO '95-The Lower-Middle Cambrian Standard of Gondwana, Special Issue. Beringria, ,.