@book{zu219907,
           title = {????????? ????????? ? ????????????????? ???????????????? (??????? ?? ?????? ????????????? Si, Ge, Sn, Pb)},
          author = {?. ?. ???????? and ?. ?. ??????? and ?. ?. ??????},
       publisher = {?????},
            year = {1991},
             url = {http://eprints.zu.edu.ua/19907/}
}