@article{ZVMMF_1979_19_4_a7,
     author = {V. G. Litvinov},
     title = {Optimal control of~the natural frequency of~a~plate of~variable thickness},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {866--877},
     publisher = {mathdoc},
     volume = {19},
     number = {4},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1979_19_4_a7/}
}