TY - JOUR AU - G.L. Cohen AU - G.H. Smith TI - A proof of Ilieff's conjecture for polynomials with four zeros. JO - Elemente der Mathematik PY - 1988 SP - 18 EP - 21 VL - 43 IS - 3 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/ELMA_1988__43_3_141419/ ID - ELMA_1988__43_3_141419 ER -