@article{zu222088,
           title = {Perfect numbers},
          author = {K. Minkova},
       publisher = {???????: ??-? ????????? ?.?.},
            year = {2016},
           pages = {93--95},
         journal = {??????????? ???????? ?????????? ???????????  ?????? ??????????? ? ???????? ?????: ??????? ?????????? ??????????? ???????-?????????? ??????????? ??? ????????? ???????? ??????????????: ???????, 13 ?????? 2016 ?./ ?? ???. ???. ?.?. ?????????},
             url = {http://eprints.zu.edu.ua/22088/}
}