@article{DE_2000_36_11_a4,
     author = {O. I. Kostyukova},
     title = {An optimality criterion in a linear-quadratic optimal control problem for a descriptor system},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1475--1481},
     publisher = {mathdoc},
     volume = {36},
     number = {11},
     year = {2000},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2000_36_11_a4/}
}