1. O’Carroll, M.J. (1980), “A VP for Ideal Flow over a Spillway,” Int’l J. Num. Meth. Engrg, Vol. 15, No. 5, pp. 767–769.
2. Liu, G.L. (1992), “The Hybrid problem of Free-Surface Gravity Spillway Flow Treated by VPs with Variable Domain: (I) Potential Formulation,” J.Hydrodynamics (Series B), Vol. 4, No. 3, pp. 118–122
3. Liu, G.L. (1986), “A Unified Theory of Hybrid Problems for Fully 3-D Incompressible Rotor-Flow Based on VPs with Variable Domain,” ASME J.Engrg. for GT & Power, Vol. 108, No. 2, pp. 254–256.
4. Liu, G.L. (1987), “New VP Families for Direct, Inverse & Hybrid Problems of Free Surface Gravity Flow over a Spillway,” Turbulence Measurements & Flow Modelling, C.J. Chen et al. (eds.), Hemisphere Publ. Corp., New York, pp. 323–332.
5. Liu, G.L. (1997), “Variable-domain variational finite element method: A general approach to free/moving boundary problems in heat and fluid flow.” Nonlinear Analysis, Vol. 30, No. 8, 5229–5239.