Electronic Journal of Differential Equations, Vol. 2004(2004), No. 28, pp. 1-9. Title: Oscillation of solutions to second order linear differential equations Author: Jan Seman (Univ. of Presov, Slovak Republik) Abstract: In this article, we establish conditions under which proper solutions of the second order linear differential equation $$ (r(t)y'(t))'+a(t)y(t)=0 $$ oscillate. The obtained results generalize, extend and improve the results in Dzurina [1]. Submitted December 17, 2003. Published February 25, 2004. Math Subject Classifications: 34C10. Key Words: Differential equation; linear; second order; oscillation criteria