@article{IVM_1960_4_a9,
     author = {F. Z. Ziatdinov},
     title = {Linear differential operators of second order in {a~Hilbert} space of vector functions with values in an abstract separable {Hilbert} space},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {89--100},
     publisher = {mathdoc},
     number = {4},
     year = {1960},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1960_4_a9/}
}