Langenhop's inequality and applications for dynamic equations. Kaymakçalan, B., Zafer, A. (2007) ETNA. Electronic Transactions on Numerical Analysis [electronic only]
Legendre's differential equation and its Hyers-Ulam stability. Jung, Soon-Mo (2007) Abstract and Applied Analysis
Levin's comparison theorems for second order nonlinear differential equations and inequalities Cheh-Chih Yeh (1990) Matematički Vesnik
Lyapunov inequalities for time scales. Bohner, Martin, Clark, Stephen, Ridenhour, Jerry (2002) Journal of Inequalities and Applications [electronic only]