Zeros of solutions of certain second order linear differential equation

In this paper, we investigate the exponent of convergence of the zero-sequence of solutions of the differential equation f + Q1eP1(z) +Q2eP2(z) +Q3eP3(z) f = 0, (1.3) where P1(z), P2(z), P3(z) are polynomials of degree n 1, Q1, Q2, Q3 are entire functions of order less than n. © 2006 Elsevier Inc. All rights reserved