@article{BAG_1986__23_138353,
     author = {R. THRON},
     title = {N-anti-exchange closure operators},
     journal = {Beitr\"age zur Algebra und Geometrie},
     pages = {101--112},
     year = {1986},
     volume = {23},
     url = {http://geodesic.mathdoc.fr/item/BAG_1986__23_138353/}
}