@article{TIMM_2006_12_1_a1,
     author = {A. A. Agrachev and R. V. Gamkrelidze},
     title = {The {Pontryagin} {Maximum} {Principle} 50~years later},
     journal = {Trudy Instituta matematiki i mehaniki},
     pages = {6--14},
     publisher = {mathdoc},
     volume = {12},
     number = {1},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TIMM_2006_12_1_a1/}
}