@article{NUMA_1970__16_132015,
     author = {L. BITTNER},
     title = {Some {Representation} {Theorems} for {Functions} and {Sets} and their  {Application} to {Nonlinear} {Programming.}},
     journal = {Numerische Mathematik},
     pages = {32--51},
     publisher = {mathdoc},
     volume = {16},
     year = {1970},
     zbl = {0217.27602},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1970__16_132015/}
}