@unpublished{zu217800,
           title = {????????? GaSb ?? GaAs ? ??????? ????????? HNO3?HHal?????????? ???????},
          school = {???????????? ????????? ??????????? ????? ????? ??????},
          author = {?. ?. ??????},
            year = {2006},
             url = {http://eprints.zu.edu.ua/17800/}
}