@article{SM_2000_191_10_a0,
     author = {A. R. Danilin},
     title = {Approximation of a~singularly perturbed elliptic problem of optimal control},
     journal = {Sbornik. Mathematics},
     pages = {1421--1431},
     publisher = {mathdoc},
     volume = {191},
     number = {10},
     year = {2000},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2000_191_10_a0/}
}