... Science Foundation of Guangdong Province in China (no. 06025059).References[1] S. B. Bank and I. Laine, “Representations of solutions of periodic second order linear differential equations, ” Journal ... cos(πρ)theorem,”Proceedings of the London Mathe-matical Society, vol. 21, no. 2, pp. 334–360, 1970.[12] S. A. Gao, Z. X. Chen, and T. W. Chen, The Complex Osc illation Theory of Linear Differential Equations, Middle ... X. Chen and S A. Gao 13[7] G. Valiron, Lectures on the General Theory of Integral Functions, Chelsea, New York, NY, USA,1949.[8] Y M. Chiang and S A. Gao, On a problem in complex oscillation...