@article{IVM_2012_1_a5,
     author = {S. V. Maryushenkov},
     title = {Estimation of the norm of an operator inverse to a~differential one},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {49--53},
     publisher = {mathdoc},
     number = {1},
     year = {2012},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2012_1_a5/}
}