@article{MZ_1977__154_172518,
     author = {Bernhard Ganter and Luc Teirlink},
     title = {A {Combinatorial} {Lemma.}},
     journal = {Mathematische Zeitschrift},
     pages = {153--156},
     publisher = {mathdoc},
     volume = {154},
     year = {1977},
     zbl = {0336.05014},
     url = {http://geodesic.mathdoc.fr/item/MZ_1977__154_172518/}
}