1. Oscillations in systems having velocity dependent frequencies;Mickens;Journal of Sound and Vibration,1999
2. Mathematical Methods of Classical Mechanics;Arnold,1978
3. The theory of population dynamics;Ginzburg;Journal of Theoretical Biology,1986
4. Ecological Orbits: How Planets Move and Populations Grow;Ginzburg,2004
5. Nonstandard Finite Difference Models of Differential Equations;Mickens,1994