@article{AM2_1972__8_136309,
     author = {Richard M. Cohn},
     title = {Types of {Singularity} of {Components} of {Difference} {Polynomials.} {(Short} {Communications).}},
     journal = {Aequationes mathematicae},
     pages = {313--314},
     publisher = {mathdoc},
     volume = {8},
     year = {1972},
     url = {http://geodesic.mathdoc.fr/item/AM2_1972__8_136309/}
}