(2013). Ecology,economics,education and legislation.Vol. I: 13th International multidisciplinary scientific geoconference SGEM 2013. Albena,Bulgaria,16.-22.6.2013. SGEM.
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Cita Chicago Style (17a ed.)
Ecology,economics,education and Legislation.Vol. I: 13th International Multidisciplinary Scientific Geoconference SGEM 2013. Albena,Bulgaria,16.-22.6.2013. Sofia: SGEM, 2013.
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Cita MLA (9a ed.)
Ecology,economics,education and Legislation.Vol. I: 13th International Multidisciplinary Scientific Geoconference SGEM 2013. Albena,Bulgaria,16.-22.6.2013. SGEM, 2013.
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