@article{10_4153_CJM_1971_003_4,
     author = {Sachs, David},
     title = {Geometric {Mappings} on {Geometric} {Lattices}},
     journal = {Canadian journal of mathematics},
     pages = {22--35},
     year = {1971},
     volume = {23},
     number = {1},
     doi = {10.4153/CJM-1971-003-4},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1971-003-4/}
}