1. Santilli R.M.: Foundations of theoretical mechanics I. The inverse problem in Newtonian mechanics, Springer, Berlin (1984)
2. Obădeanu V., Marinca V.: The inverse problem in analytical mechanics, West Publishing House, Timişoara (1992)
3. Obădeanu V. Marinca V: On the inverse problem in Newtonian mechanics Tensor N.S 48 30–35 (1989)
4. Dincă F., Teodosiu C.: Nonlinear and random vibrations, Academic Press, New York (1973)
5. Cveticanin L.: Oscillator with strong quadratic damping force, Pub. Inst. Math. 85 119–130 (2009)