1. D. Hilbert, Foundations of Geometry, Open Court Publishing Company, La Salla, Illinois, 1971.
2. W. T. Wu, Mathematics Mechanization, Science Press, Beijing, 2003.
3. A. Tarski, A Decision Method for Elementary Algebra and Geometry, The RAND Corporation Press, Santa Monica, 1948.
4. A. Seidenberg, A new decision method of elementary algebra, Annals of Mathematics, 1954, 60: 365–371.
5. G. Collins, Quantifier elimination for real closed fields by cylindrical algebraic decomposition, Lecture Notes Computer Sciences 33, Springer-Verlag, Berlin, Heidelberg, 1975.