By Grigorov A.   Georgiev A.   Petrov M.   Stefanov K.   Varbanov S.   in International Journal of Continuing Engineering Education and Life-Long Learnin

ISSN:1560-4624|19|4-5|300-312

Inderscience Publishers‎(2009)‎

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By Cholakova Tsv.   Zagraniarsky Y.   Simova S.   Varbanov S.   Dobrev A.   in Phosphorus, Sulfur, and Silicon and the Related Elements

ISSN:1042-6507|180|7|1721-1728

Taylor & Francis Ltd‎(2005)‎

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