海軍スペツナズ
(ロシア語) Divers of Special Purpose
(ロシア語) The Foundation of Underwater Spetsnaz: Strelna operation
About Russian frogmen (uses the name Delfin)
(英語) (ロシア語) Extracts from a book about Soviet and Russian combat divers by Alexander Rzhavin Senior who served in the Soviet Naval Spetsnaz in from 1973 to 1976. With photographs. English- and Russian-language versions.