@article{MAN_1970__184_161915,
     author = {K. RITTER},
     title = {Optimization {Theory} in {Linear} {Spaces.} {Part} {III.} {Mathematical} {Programming} in {Partially} {Ordered} {Banach} {Spaces.}},
     journal = {Mathematische Annalen},
     pages = {133--154},
     publisher = {mathdoc},
     volume = {184},
     year = {1970},
     zbl = {0186.18203},
     url = {http://geodesic.mathdoc.fr/item/MAN_1970__184_161915/}
}