@article{SLC_1991_26_a3,
     author = {W. Florek and T. Lulek},
     title = {Combinatorial {Analysis} of {Magnetic} {Configurations}},
     journal = {S\'eminaire lotharingien de combinatoire},
     year = {1991},
     volume = {26},
     url = {http://geodesic.mathdoc.fr/item/SLC_1991_26_a3/}
}