@article{MZ_1967__100_170818,
     author = {David A. Foulser},
     title = {A {Generalization} of {Andr\'e's} {Systems.}},
     journal = {Mathematische Zeitschrift},
     pages = {380--395},
     publisher = {mathdoc},
     volume = {100},
     year = {1967},
     zbl = {0152.18903},
     url = {http://geodesic.mathdoc.fr/item/MZ_1967__100_170818/}
}