@article{M2AN_1972__6_2_65_0,
     author = {Michel, Philippe},
     title = {Pour une extension du principe du maximum de {Pontrjagin}},
     journal = {Revue fran\c{c}aise d'automatique informatique recherche op\'erationnelle. Math\'ematique},
     pages = {65--76},
     year = {1972},
     publisher = {Dunod},
     volume = {6},
     number = {R2},
     mrnumber = {361980},
     zbl = {0254.49022},
     language = {fr},
     url = {https://www.numdam.org/item/M2AN_1972__6_2_65_0/}
}