@article{10_4153_CJM_1980_061_x,
     author = {Vel, M. van de},
     title = {A {Hahn-Banach} {Theorem} in {Subbase} {Convexity} {Theory}},
     journal = {Canadian journal of mathematics},
     pages = {804--820},
     year = {1980},
     volume = {32},
     number = {4},
     doi = {10.4153/CJM-1980-061-x},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1980-061-x/}
}