| Reference | {Deposit:: COMMODITIES RESEARCH UNIT, LTD. THE BASE METAL INDUSTRIES}{Deposit:: OF EASTERN EUROPE. VOLUMES I & II, LONDON, 1990.}{Deposit:: DOKOV, R. ET AL. COMMITTE OF GEOLOGY, BULGARIAN GEOLOGICAL}{Deposit:: SOCIETY, GEOLOGICAL INSTITUTE - BULGARIAN ACADEMY OF}{Deposit:: SCIENCES, METALLOGENIC MAP OF BULGARIA, SOFIA, 1989.}{Deposit:: CERNA, THE MINING AND METALLURGICAL INDUSTRIES OF EASTERN}{Deposit:: EUROPE, VOL II, PARIS, 1991.} |