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@article{PORMA_1958__17_1_114798, author = {Capel, C.E. and Strother, W.L.}, title = {Multi-valued functions and partial order}, journal = {Portugaliae mathematica}, pages = {41--47}, publisher = {mathdoc}, volume = {17}, number = {1}, year = {1958}, mrnumber = {0101512}, zbl = {0088.15001}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1958__17_1_114798/} }
Capel, C.E.; Strother, W.L. Multi-valued functions and partial order. Portugaliae mathematica, Tome 17 (1958) no. 1, pp. 41-47. http://geodesic.mathdoc.fr/item/PORMA_1958__17_1_114798/