@article{SLC_1987_16_a10,
     author = {Walter Wenzel},
     title = {The {Tutte-Group} of a {Matroid}},
     journal = {S\'eminaire lotharingien de combinatoire},
     publisher = {mathdoc},
     volume = {16},
     year = {1987},
     url = {http://geodesic.mathdoc.fr/item/SLC_1987_16_a10/}
}