@article{MZM_2004_76_6_a9,
     author = {S. Ya. Serovaǐskiǐ},
     title = {Approximate {Penalty} {Method} in {Optimal} {Control} {Problems} for {Nonsmooth} {Singular} {Systems}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {893--904},
     publisher = {mathdoc},
     volume = {76},
     number = {6},
     year = {2004},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2004_76_6_a9/}
}