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@article{MS2_1960__8_165756, author = {Folke Eriksson}, title = {The {Relation} {Between} {Two} {Generalisations} of the {Notion}}, journal = {Mathematica Scandinavica}, pages = {339--355}, publisher = {mathdoc}, volume = {8}, year = {1960}, zbl = {0106.36404}, url = {http://geodesic.mathdoc.fr/item/MS2_1960__8_165756/} }
Folke Eriksson. The Relation Between Two Generalisations of the Notion. Mathematica Scandinavica, Tome 8 (1960), pp. 339-355. http://geodesic.mathdoc.fr/item/MS2_1960__8_165756/