@article{DE_1989_25_8_a18,
     author = {A. M. Khludnev},
     title = {Limit transitions in optimal control problems for a fourth-order operator},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1427--1435},
     publisher = {mathdoc},
     volume = {25},
     number = {8},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1989_25_8_a18/}
}