@article{MAIS_2011_18_3_a6,
     author = {N. A. Dem'yankov},
     title = {About two finite-dimensional approximations of the periodic boundary value problem},
     journal = {Modelirovanie i analiz informacionnyh sistem},
     pages = {63--74},
     publisher = {mathdoc},
     volume = {18},
     number = {3},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MAIS_2011_18_3_a6/}
}