@article{10_4153_CJM_1972_027_4,
     author = {Bruns, G\"unter and Kalmbach, Gudrun},
     title = {Varieties of {Orthomodular} {Lattices.} {II}},
     journal = {Canadian journal of mathematics},
     pages = {328--337},
     year = {1972},
     volume = {24},
     number = {2},
     doi = {10.4153/CJM-1972-027-4},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1972-027-4/}
}