@article{DE_1988_24_11_a14,
     author = {I. A. Blatov and V. V. Strygin},
     title = {Convergence of the spline collocation method on optimal grids for singularly perturbed boundary value problems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1977--1987},
     year = {1988},
     volume = {24},
     number = {11},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1988_24_11_a14/}
}