@article{AM2_1973__9_136376,
     author = {CHARLES H. FRANKE},
     title = {A {Characterization} of {Linear} {Difference} {Equations} {Which} are {Solvable} by {Elementary} {Operations} {(Short} {Communication)}},
     journal = {Aequationes mathematicae},
     pages = {312--312},
     publisher = {mathdoc},
     volume = {9},
     year = {1973},
     url = {http://geodesic.mathdoc.fr/item/AM2_1973__9_136376/}
}