1. S. J. Liao, The homotopy analysis method and its applications, in mechanics, Ph. D. Dissertation, Shanghai Jiaotong University (1992).
2. S. J. Liao, A kind of linear invariance under homotopy and some simple applications of it in mechanics, Bericht Nr. 520, Institut fuer Schiffbau der Universitaet Hamburg (1992).
3. S. J. Liao, A second-order approximate analytical solution of a simple pendulum by the process analysis method.J. Applied Mechanics,14 (1992), 1173–1191.
4. S. J. Liao, Application of process analysis method to the solution of 2D non-linear progressive gravity waves,J. Ship Research,36 (1992) 30–37.
5. S. J. Liao, A kind of approximate solution technique which does not depend upon small parameters: a special example,Int. J. Non-Linear Mechanics.30 (1995), 371–380.