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@article{ELMA_1988__43_3_141419, author = {G.L. Cohen and G.H. Smith}, title = {A proof of {Ilieff's} conjecture for polynomials with four zeros.}, journal = {Elemente der Mathematik}, pages = {18--21}, publisher = {mathdoc}, volume = {43}, number = {3}, year = {1988}, zbl = {0699.30006}, url = {http://geodesic.mathdoc.fr/item/ELMA_1988__43_3_141419/} }
G.L. Cohen; G.H. Smith. A proof of Ilieff's conjecture for polynomials with four zeros.. Elemente der Mathematik, Tome 43 (1988) no. 3, pp. 18-21. http://geodesic.mathdoc.fr/item/ELMA_1988__43_3_141419/