@article{zu234726,
           title = {???????????? ???????? ????????????? ???????????? ?? ????????? Blue Flag},
          author = {?. ?. ??????????? and ?. ?. ????????},
       publisher = {???????? ???????????? ???????-??????????? ??????? "?????????????? ?????"},
            year = {2020},
           pages = {277--283},
         journal = {?????????????? ?????},
             url = {http://eprints.zu.edu.ua/34726/}
}