@article{TIMM_2016_22_4_a16,
     author = {L. F. Korkina and M. A. Rekant},
     title = {On some functions of a linear closed operator},
     journal = {Trudy Instituta matematiki i mehaniki},
     pages = {173--187},
     publisher = {mathdoc},
     volume = {22},
     number = {4},
     year = {2016},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TIMM_2016_22_4_a16/}
}