@article{zu226667,
           title = {Theoretical aspects of group working},
          author = {S. Derkach},
       publisher = {???????: ???-?? ??? ??. ?. ??????},
            year = {2017},
         journal = {????? ? ????: ??????? ????????? ?????????? ????????? ??? ? ????? ??????: ??????? ?????????? IV ???????????????  ???????-??????????? ???????? (29 ????????? 2017 ?.).},
             url = {http://eprints.zu.edu.ua/26667/}
}