@article{VTGU_2018_54_a1,
     author = {K. B. Mansimov and Sh. M. Rasulova},
     title = {On optimality of singular controls in an optimal control problem},
     journal = {Vestnik Tomskogo gosudarstvennogo universiteta. Matematika i mehanika},
     pages = {17--33},
     publisher = {mathdoc},
     number = {54},
     year = {2018},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VTGU_2018_54_a1/}
}