@incollection{AST_1980__75-76__199_0,
     author = {Mitter, Sanjoy K.},
     title = {The sufficiency of maximum principle},
     booktitle = {Analyse des syst\`emes},
     series = {Ast\'erisque},
     pages = {199--205},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {75-76},
     year = {1980},
     zbl = {0459.93052},
     language = {en},
     url = {http://archive.numdam.org/item/AST_1980__75-76__199_0/}
}