@article{DE_1974_10_10_a17,
     author = {M. L. Gusakova},
     title = {On the necessary optimality conditions for systems of neutral type},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1894--1897},
     publisher = {mathdoc},
     volume = {10},
     number = {10},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1974_10_10_a17/}
}