SGEM 2017.17th international multidisciplinary scientific geoconference. Volume 17. Ecology, economics, education and legislation. Issue 53 [elektronický zdroj]
SGEM 2017: international multidisciplinary scientific geoconference. 17 29.June-5.July 2017 Albena
1. vyd
Sofia STEF92 Technology 2017 . - online
ISBN 978-619-7408-10-2
ISSN 1314-2704
(1) - článok