| Reference | {Deposit:: COMMODITY RESEARCH UNIT, LTD. THE BASE METAL INDUSTRIES OF}{Deposit:: EASTERN EUROPE, VOL I, LONDON, 1990.}{Deposit:: EASTERN EUROPE, VOL II, LONDON, 1990.}{Deposit:: DOKOV, R., ET AL, GEOLOGICAL INSTITUTE - BULGARIAN ACADEMY}{Deposit:: OF SCIENCES. METALLOGENIC MAP OF BULGARIA, SOFIA, 1989.} |