@article{TRSPY_1971_112_a10,
     author = {R. V. Gamkrelidze},
     title = {Necessary first order conditions, and the axiomatics of extremal problems},
     journal = {Informatics and Automation},
     pages = {152--180},
     publisher = {mathdoc},
     volume = {112},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1971_112_a10/}
}