@article{TRSPY_1988_185_a0,
     author = {E. R. Avakov},
     title = {Necessary conditions for a minimum for nonregular problems in {Banach} spaces. {The} maximum principle for abnormal optimal control problems},
     journal = {Informatics and Automation},
     pages = {3--29},
     publisher = {mathdoc},
     volume = {185},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1988_185_a0/}
}