| Reference | {Deposit:: COMMODITIES RESEARCH UNIT, LTD. THE BASE METALS INDUSTRIES}{Deposit:: OF EASTERN EUROPE, VOL I & II, LONDON, 1990.}{Deposit:: CERNA, THE MINING AND METALLURGICAL INDUSTRIES OF EASTERN}{Deposit:: EUROPE, VOL II, PARIS, 1991.}{Deposit:: DOKOV, R. ET AL, METALLOGENIC MAP OF BULGARIA, LIST OF ORE}{Deposit:: DEPOSITS. COMMITTEE OF GEOLOGY, BULGARIAN GEOLOGICAL}{Deposit:: SOCIETY, GEOLOGICAL INSTITUTE - BULGARIAN ACADEMY OF}{Deposit:: SCIENCES, SOFIA, 1989.}{Reserve-Resource:: METALLGESELLSCHAFT, DEVELOPMENT TRENDS OF THE NON-FERROUS}{Reserve-Resource:: METALS INDUSTRY IN EASTERN EUROPE, FRANKFURT, 1991.} |