1. . The Finite Element Method. Prentice-Hall: Englewood Cliffs, NJ, 1987.
2. . Finite Element Procedures. Prentice-Hall: Englewood Cliffs, NJ, 1996.
3. . A Rational Finite Element Basis. Academic Press: New York, NY, 1975.
4. Rational Wachspress-type Finite Elements on Regular Hexagons
5. On Wachspress quadrilateral patches