@article{10_4064_ap_57_3_243_252,
     author = {Zbigniew Gajda and Andrzej Smajdor and Wilhelmina Smajdor},
     title = {A theorem of the {Hahn-Banach} type and its applications},
     journal = {Annales Polonici Mathematici},
     pages = {243--252},
     publisher = {mathdoc},
     volume = {57},
     number = {3},
     year = {1992},
     doi = {10.4064/ap-57-3-243-252},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-57-3-243-252/}
}