@article{MZ_1974__138_172077,
     author = {Eugene C. Johnsen and Thomas Storer},
     title = {Combinatorial {Structures} in {Loops.}},
     journal = {Mathematische Zeitschrift},
     pages = {1--14},
     publisher = {mathdoc},
     volume = {138},
     year = {1974},
     zbl = {0276.05019},
     url = {http://geodesic.mathdoc.fr/item/MZ_1974__138_172077/}
}