Anton Sotirov

University of Mining and Geology "St. Ivan Rilski", 1700 Sofia. Bulgaria
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Montanuniversität, A -8700 Leoben, Austria

Volume 34 3-4 December 2004

Instilut für Geowissenschaften, Мontanuniverität Leoben, А-8700 Leoben, Аustria
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University of Mining and Geology "Sv. Ivan Rilski", 1700 Sofia, Bulgaria

Volume 33 1-2 June 2003

University of Mining and Geology "Sv. Ivan Rilski". Sofia, 1100 Bulgaria
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University of Mining and Geology "Sv. Ivan Rilski". Sofia, 1100 Bulgaria

Volume 30 3-4 February 2001