Não informado. (2008). Communications of the Department of Chemistry. Bulgarian Academy of Sciences.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Communications of the Department of Chemistry. Sofia: Bulgarian Academy of Sciences, 2008.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Communications of the Department of Chemistry. Bulgarian Academy of Sciences, 2008.
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