@article{SF_1986__34_134831,
     author = {J. Leech},
     title = {Towards a theory of noncommutative lattices.},
     journal = {Semigroup forum},
     pages = {117--120},
     publisher = {mathdoc},
     volume = {34},
     year = {1986},
     zbl = {0607.06004},
     url = {http://geodesic.mathdoc.fr/item/SF_1986__34_134831/}
}