Řehánek and Heliasz, 1993
From dinoflaj3
Řehánek, J. and Heliasz, H., 1993: Microfacies and microbiostratigraphy of the Oxfordian-Lower Kimmeridgian on the basis of cadosinids and stomiosphaerids in the Czestochowa region of Poland. Geologica Carpathica, v.44, no.2, p.81-93, pl.1-2.