Iakovleva and Kulkova, 2002
From dinoflaj3
Iakovleva, A.I. and Kulkova, I.A., 2002: Paleocene-Eocene dinoflagellate cysts and continental palynomorphs of the Pur Downstream Basin (northwestern Siberia): biostratigraphical and palaeoenvironmental implications. Revista Española de Micropaleontología, v.33, pt.1, p.1-31.