@article{TIMM_2017_23_3_a1,
     author = {R. R. Akopyan and M. S. Saidusajnov},
     title = {Three extremal problems in the {Hardy} and {Bergman} spaces of functions analytic in a disk},
     journal = {Trudy Instituta matematiki i mehaniki},
     pages = {22--32},
     year = {2017},
     volume = {23},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TIMM_2017_23_3_a1/}
}