MATHEMATISCHE NACHRICHTEN, cilt.281, sa.9, ss.1273-1282, 2008 (SCI-Expanded)
In this paper we obtain instability and stability criteria for second order linear impulsive differential equations with periodic coefficients. Further, a Lyapunov type inequality is also established. (C) 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.