@article{IVM_2013_5_a0,
     author = {V. V. Arestov and M. A. Filatova},
     title = {Approximation of differentiation operator in the space $L_2$ on semiaxis},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {3--12},
     publisher = {mathdoc},
     number = {5},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2013_5_a0/}
}