Geodesic
Elementary proof of the reality of the zeros of beta-polynomials of complete graphs
Kragujevac Journal of Mathematics, Tome 22 (2000) no. 1.

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Kragujevac J. Math. 22 (2000) 49-56. ELEMENTARY PROOF OF THE REALITY OF THE ZEROS OF b-POLYNOMIALS OF COMPLETE GRAPHS Xueliang Lia and Ivan Gutmanb aDepartment of Applied Mathematics, Northwestern Polytechnical University, X'ian, Shaanxi 710072, P. R. China, and bFaculty of Science, P. O. Box 60, 34000 Kragujevac, Yugoslavia (Received January 3, 2000) ABSTRACT. An elementary proof is given for the reality of all zeros of b-polynomials associated with complete graphs. 
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     title = {Elementary proof of the reality of the zeros of beta-polynomials of complete graphs},
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Xueliang Li; Ivan Gutman. Elementary proof of the reality of the zeros of beta-polynomials of complete graphs. Kragujevac Journal of Mathematics, Tome 22 (2000) no. 1. http://geodesic.mathdoc.fr/item/KJM_2000_22_1_a5/