N. N. Bogolyubov
Bogolubow N N; 1914, O pozvonk’ pterodaktilya uz’ vyerkhnyem’lovyikh’ otlozhyenii Saratovskoi gubyernii (A propos d'une vertebre de Pterodactyle des depots cretaces superieurs du gouvernment de Sartoff) [On a pterodactyle vertebra from Upper Cretaceous deposits of the Government of Saratoff], Annuaire geologique et mineralogique de la Russie, Vol.16 Pt.1 pp.1-7 1914 Russian text, French resume