@article{MZ_1967__95_170660,
     author = {Manfred Reimer},
     title = {Zur {Theorie} der linearen {Differenzformeln.}},
     journal = {Mathematische Zeitschrift},
     pages = {373--402},
     year = {1967},
     volume = {95},
     zbl = {0143.37902},
     url = {http://geodesic.mathdoc.fr/item/MZ_1967__95_170660/}
}