@article{MZM_1996_60_4_a3,
     author = {S. Ya. Serovaǐskiǐ},
     title = {Optimal control of a~nonlinear singular system with state constraints},
     journal = {Matemati\v{c}eskie zametki},
     pages = {511--518},
     publisher = {mathdoc},
     volume = {60},
     number = {4},
     year = {1996},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1996_60_4_a3/}
}