@article{SM_2020_211_6_a0,
     author = {E. R. Avakov and G. G. Magaril-Il'yaev},
     title = {Local infimum and a~family of maximum principles in optimal control},
     journal = {Sbornik. Mathematics},
     pages = {750--785},
     year = {2020},
     volume = {211},
     number = {6},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2020_211_6_a0/}
}