@article{GDZPPN001261398, title = {Normal skew lattices.}, journal = {Semigroup forum}, volume = {44}, year = {1992}, pages = {1-8}, zbl = {0754.06004}, url = {http://dml.mathdoc.fr/item/GDZPPN001261398} }
Leech, J. Normal skew lattices.. Semigroup forum, Tome 44 (1992) pp. 1-8. http://gdmltest.u-ga.fr/item/GDZPPN001261398/