@article{DE_1989_25_9_a26,
     author = {R. K. Tagiyev},
     title = {An estimate for the rate of convergence of difference approximations and regularization of a problem of optimal control for a second-order differential equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1626--1629},
     publisher = {mathdoc},
     volume = {25},
     number = {9},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1989_25_9_a26/}
}