@article{ZNSL_1973_35_a2,
     author = {L. N. Dovbysh},
     title = {On approximation and decomposability in a~series of elements in {Banach} space},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {12--20},
     publisher = {mathdoc},
     volume = {35},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1973_35_a2/}
}