Rumen Petrov has written:
'Neshto nepreodolimo'
Rumen Denev has written: 'Posledno'
A A. Petrov has written: 'Catalytic isomerisation of hydrocarbon'
Rumen Danov has written: 'Zhiva stomana'
Luben Petrov has written: 'The two crosses'
Gennadii Fedorovich Petrov has written: 'Kronshtadt'
I. N. Petrov has written: 'Mesto sluzhby - okean'
Aleksandr Vladimirovich Petrov has written: 'Prichaly'
Rumen Shomov has written: 'Spomen za alchnata dusha'
P. Petrov has written: 'Soviet trade unions and wages'
Yurii Konstantinovich Petrov has written: 'Finansovaya sluzhba predpriyatiya'
Yurii Grigor' evich Petrov has written: 'Magnitka'
Grigoriyi PETROV has written: 'Buyuk sanatiilar ve ustun yapitlari'