@article{SLC_1986_15_a13,
     author = {Heinz L\"uneburg},
     title = {Addieren ohne {\"Ubertrag}},
     journal = {S\'eminaire lotharingien de combinatoire},
     publisher = {mathdoc},
     volume = {15},
     year = {1986},
     url = {http://geodesic.mathdoc.fr/item/SLC_1986_15_a13/}
}