@article{TM_2010_268_a7,
     author = {R. V. Gamkrelidze},
     title = {The {Pontryagin} derivative in optimal control},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {94--99},
     publisher = {mathdoc},
     volume = {268},
     year = {2010},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_2010_268_a7/}
}