Шунгит (Bulgarian Wikipedia)

Analysis of information sources in references of the Wikipedia article "Шунгит" in Bulgarian language version.

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books.google.com

Efremova, S.V. Water treatment with a shungite sorbent and biosorbents on its base // Russian Journal of Applied Chemistry 79 (3). 2006. DOI:10.1134/s1070427206030128. с. 397 – 402. Посетен на 7 юли 2012.

Efremova, S.V. Water treatment with a shungite sorbent and biosorbents on its base // Russian Journal of Applied Chemistry 79 (3). 2006. DOI:10.1134/s1070427206030128. с. 397 – 402. Посетен на 7 юли 2012.