@article{VTAMU_2018_23_124_a19,
     author = {M. I. Sumin},
     title = {Why regularization of {Lagrange} principle and {Pontryagin} maximum principle is needed and what it gives},
     journal = {Vestnik rossijskih universitetov. Matematika},
     pages = {757--775},
     publisher = {mathdoc},
     volume = {23},
     number = {124},
     year = {2018},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VTAMU_2018_23_124_a19/}
}