@article{TRSPY_1991_197_a1,
     author = {M. I. Zelikin and V. F. Borisov},
     title = {Regimes with frequented switches in the problems of optimal control},
     journal = {Informatics and Automation},
     pages = {85--166},
     publisher = {mathdoc},
     volume = {197},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1991_197_a1/}
}