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@article{SF_1992__44_1_135125, author = {J. Leech}, title = {Normal skew lattices.}, journal = {Semigroup forum}, pages = {1--8}, publisher = {mathdoc}, volume = {44}, number = {1}, year = {1992}, zbl = {0754.06004}, url = {http://geodesic.mathdoc.fr/item/SF_1992__44_1_135125/} }
J. Leech. Normal skew lattices.. Semigroup forum, Tome 44 (1992) no. 1, pp. 1-8. http://geodesic.mathdoc.fr/item/SF_1992__44_1_135125/