00502naa#a2200157#i#450# EN\ACADEMUS PUBLISHING\bibl\1800 20240426153610.5 20161201b2016####ek#y0engy0150####ca RU EVOLUTION OF SANDY BEACH IN THE CITY OF VARNA Conference article/thesis San Francisco Academus Publishing 2016 0 с. Conference article/thesis local Экология. 34.35 grnti Veliko Z Dachev academuspub.com