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@article{MAN_1980__247_163350, author = {Vlastimil Dlab and Claus Michael Ringel}, title = {Perfect {Elements} in the {Free} {Modular} {Lattices.}}, journal = {Mathematische Annalen}, pages = {95--100}, publisher = {mathdoc}, volume = {247}, year = {1980}, zbl = {0443.06005}, url = {http://geodesic.mathdoc.fr/item/MAN_1980__247_163350/} }
Vlastimil Dlab; Claus Michael Ringel. Perfect Elements in the Free Modular Lattices.. Mathematische Annalen, Tome 247 (1980), pp. 95-100. http://geodesic.mathdoc.fr/item/MAN_1980__247_163350/