@article{DE_1986_22_3_a13,
     author = {S. I. Lyashko},
     title = {Optimal control of coefficients for certain systems with distributed parameters},
     journal = {Differencialʹnye uravneni\^a},
     pages = {458--462},
     publisher = {mathdoc},
     volume = {22},
     number = {3},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1986_22_3_a13/}
}