1. Second Course in Ordinary Differential Equations for Scientists and Engineers;HUMI,1988
2. Oscillations in Planar Dynamic Systems;MICKENS,1996
3. A phase-space analysis of a nonlinear oscillator equation;MICKENS;Journal of Sound and Vibration,1997
4. Table of Integrals, Series, and Products;GRADSHTEYN,1965
5. Nonstandard Finite Difference Models of Differential Equations;MICKENS,1994