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14th GeoConference on Energy and clean technologies
- 14th GeoConference on Energy and clean technologies : international multidisciplinary scientific geoconference SGEM 2014, 17-26 June 2014, Albena Bulgaria : conference proceedings. Vol. II. 1. vyd. Sofia : STEF92, 2014. ISBN 978-619-7105-16-2. ISSN 1314-2704.
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