Biogeography of Ordovician, Silurian, and Devonian chitinozoans.
Reference:
Laufeld,S. (1979)
Biogeography of Ordovician, Silurian, and Devonian chitinozoans. Historical biogeography, plate tectonics, and the changing environment : proceedings of the 37th Annual Biology Colloquium, and selected papers.(Jane Gray and Arthur J. Boucot,editors).Oregon State University Press
P. 75- 90