The description of pupae of Colymbetes paykulli Er. and C. dolabratus (Payk.) with a key to the identification of pupae of the European species of Colymbetes Clairv. (Coleoptera, Dytiscidae) / Kazimierz Galewski. — Warszawa : Państwowe Wydawnictwo Naukowe, 1967. — 8 с. — (Annales zoologici ; t. 24, № 5) - Galewski, Kazimierz (Annales zoologici, 1967)