Permian pelecypods of the Soviet sector of the Arctic 
Li︠u︡tkevich, E. M.(Evgeniĭ Mikhaĭlovich)
National Lending Library for Science & Technology,
1968
Originally published as 'Peletsipody permi sovetskogo sektora Arktiki'. Vsesoiuznyi neftyanoi nauchnoissledovatel'skii geologorazvedochnii institut, 1960