| 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, COMMITTEE OF GEOLOGY, BULGARIAN GEOLOGICAL}{Deposit:: SOCIETY, AND GEOLOGICAL INSTITUTE - BULGARIAN ACADEMY OF}{Deposit:: SCIENCES. METALLOGENIC MAP OF BULGARIA, SOFIA, 1989.} |