@article{VMUMM_1993_6_a21,
     author = {L. A. Manita},
     title = {Optimal control of an oscillator with variable stiffness},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {89--91},
     publisher = {mathdoc},
     number = {6},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1993_6_a21/}
}