@article{10_4064_sm_31_4_319_329,
     author = {M. Altman},
     title = {A general maximum principle for optimization problems},
     journal = {Studia Mathematica},
     pages = {319--329},
     publisher = {mathdoc},
     volume = {31},
     number = {4},
     year = {1968},
     doi = {10.4064/sm-31-4-319-329},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-31-4-319-329/}
}