@article{AM2_1972__8_136310,
     author = {Charles H. Franke},
     title = {Reducible {Linear} {Difference} {Operators.} {(Short} {Communications).}},
     journal = {Aequationes mathematicae},
     pages = {314--314},
     publisher = {mathdoc},
     volume = {8},
     year = {1972},
     url = {http://geodesic.mathdoc.fr/item/AM2_1972__8_136310/}
}