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- Applied soil ecology / editor, Premjit Sharma. New Delhi : Gene-Tech Books, 2007 . 1 online zdroj (vi, 272 stran)
http://search.ebscohost.com/login.aspx?direct=true&scope=site&db=nlebk&AN=321507
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- Soil organic matter : ecology, environmental impact and management / Pedro A. Björklund and Frederick V. Mello, editors. New York : Nova Science Publishers, [2012] ©2012 . 1 online zdroj (x, 140 stran)
http://search.ebscohost.com/login.aspx?direct=true&scope=site&db=nlebk&AN=541668book