Langenhop's inequality and applications for dynamic equations. Kaymakçalan, B.; Zafer, A. — 2007 ETNA. Electronic Transactions on Numerical Analysis [electronic only]
On Lyapunov inequality in stability theory for Hill's equation on time scales. Merdivenci Atici, F.; Guseinov, G.Sh.; Kaymakçalan, B. — 2000 Journal of Inequalities and Applications [electronic only]