I don't know a lot about it but the code name 'Tricycle' rings a bell.... Real name Dusko Popov, a Serbian double agent.
Dusko Stevanovic goes by Duca.
Dusko Modrinic was born in 1979, in Zadar, Croatia.
Gavriil Popov's birth name is Popov, Gavriil Nikolayevich.
Stoyan Popov's birth name is Stoyan Hristov Popov.
Dusko Gruborovic was born on May 9, 1956, in Glina, Croatia.
Raphael Popov was born in 1830.
Anatoly Popov was born in 1960.
A. I. Popov has written: 'Borodinskoe srazhenie'
Raphael Popov died in 1876.
Julian Popov was born in 1959.
Nikolay Popov was born in 1931.