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@article{SF_1972__5_133923, author = {E.Ja. Gabovic and G.J. Rubanovic}, title = {The lattice of convex subgroupoids of an ordered groupoid.}, journal = {Semigroup forum}, pages = {54--64}, publisher = {mathdoc}, volume = {5}, year = {1972}, zbl = {0264.06012}, url = {http://geodesic.mathdoc.fr/item/SF_1972__5_133923/} }
E.Ja. Gabovic; G.J. Rubanovic. The lattice of convex subgroupoids of an ordered groupoid.. Semigroup forum, Tome 5 (1972), pp. 54-64. http://geodesic.mathdoc.fr/item/SF_1972__5_133923/