@article{TM_1998_220_a2,
     author = {A. V. Arutyunov},
     title = {Relaxation and perturbation of optimal control problem},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {27--34},
     publisher = {mathdoc},
     volume = {220},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1998_220_a2/}
}