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Year of Publication 06.02.2008

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Year of Publication 20.10.2005

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Year of Publication 18.09.2008

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Year of Publication 15.02.2008

by STRASHIMIROV ASEN, PETKOV MIHAIL, IVANOV LYUDMIL
Year of Publication 31.01.2008

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Year of Publication 20.10.2005

by STRASHIMIROV ASEN, PETKOV MIHAIL, IVANOV LYUDMIL
Year of Publication 31.10.2005

by HRANOV, LYUDMIL IVANOV, YORDANOV, JURII VALCHEV, DASKALOV, ZIVKO ASSENOV, DACHEV, BOGOMIL DAVIDOV, GEORGIEV, BOJAN GEORGIEV, ZVETKOVA, SVETLANA ATANASSOVA
Year of Publication 25.09.1991