@article{AM2_1973__9_136350,
     author = {RICHARD M. COHN},
     title = {Types of {Singularity} of {Components} of {Difference} {Polynomials}},
     journal = {Aequationes mathematicae},
     pages = {236--241},
     publisher = {mathdoc},
     volume = {9},
     year = {1973},
     zbl = {0265.12103},
     url = {http://geodesic.mathdoc.fr/item/AM2_1973__9_136350/}
}