@article{DE_2006_42_11_a5,
     author = {Yu. N. Kiselev and S. N. Avvakumov and M. V. Orlov},
     title = {The hyperbolic tangent law in optimal control synthesis for a nonlinear model with discounting},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1490--1506},
     publisher = {mathdoc},
     volume = {42},
     number = {11},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2006_42_11_a5/}
}