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@article{SF_1976__12_134160, author = {H. Storrer}, title = {An algebraic proof of {Isbell'} s zigzag theorem.}, journal = {Semigroup forum}, pages = {83--88}, publisher = {mathdoc}, volume = {12}, year = {1976}, zbl = {0325.20064}, url = {http://geodesic.mathdoc.fr/item/SF_1976__12_134160/} }
H. Storrer. An algebraic proof of Isbell' s zigzag theorem.. Semigroup forum, Tome 12 (1976), pp. 83-88. http://geodesic.mathdoc.fr/item/SF_1976__12_134160/