@article{AM2_1980__21_182417,
     author = {Ulrich Faigle},
     title = {\"Uber {Morphismen} halbmodularer {Verb\"ande.}},
     journal = {Aequationes mathematicae},
     pages = {53--67},
     publisher = {mathdoc},
     volume = {21},
     year = {1980},
     zbl = {0443.06009},
     url = {http://geodesic.mathdoc.fr/item/AM2_1980__21_182417/}
}