Boytsova,E.P. et al. (1960)
Spore and pollen complexes of Mesozoic deposits of the USSR. (In: Pre-Quaternary Micropaleontology) [ Sporovo-pyl'tsevye kompleksy Mezozoickikh otlozhenii SSSR. (In: Do-Chetvertninaya Mikropaleontologii) ] International Geological Congress,Proceedings,XX!st Session. The Cretaceous-Tertiary Boundary: Report of Soviet Geologists, Part 6.
# 6 P. 211- 221