@article{10_4064_sm_44_3_275_285,
     author = {Leonard Berkovitz},
     title = {Existence theorems in problems of optimal control},
     journal = {Studia Mathematica},
     pages = {275--285},
     publisher = {mathdoc},
     volume = {44},
     number = {3},
     year = {1972},
     doi = {10.4064/sm-44-3-275-285},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-44-3-275-285/}
}