00549naa#a2200169#i#450# EN\ACADEMUS PUBLISHING\bibl\1800 /en/manage/index 20250225053025.2 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 fht.editorum.ru /en/manage/index