1. Bellman. R., 1964,Perturbation Technique in Mathematics, Physics and Engineering, Holt, Rinehart and Winston.
2. Bharucha-Reid, 1968,Probabilistic Methods in Applied Mathematics, Vol. 1, p. 48, Academic press.
3. Byungyoung Moon, Jin-Wook Kim and Bo-suk Yang, 1999. “Non-Linear Vibration Analysis of Mechanical Structure System using Substruc-ture Synthesis Method,”KSME International Journal, Vol. 13, No. 9, pp. 620–629.
4. Byungyoung Moon, Beomsoo Kang, 2001, “Non-Linear Vibration Analysis of Rotor System using Substructure Synthesis Method (Analysis with Consideration of Nonlinear Sensitivity),“JSME International Journal Series C, Vol. 44, No. I. pp. I2–19.
5. Caravanu, P. and Thomson, W. T., 1973, “Frequency Response of a Dynamic System with Statistical Damping,“AIAA Journal, Vol. 11, No. 2, p. 170.