1. C. C. J. Roothaan, Rev. Mod. Phys. 32, 179 (1960).RMPHAT0034-6861
2. C. C. J. Roothaan and P. S. Bagus, Methods in Computational Physics (Academic Press Inc., New York, 1963), Vol. II.
3. K. S. Kunz, Numerical Analysis (McGraw‐Hill Book Co., New York, 1957).
4. B. Wendroff, Theoretical Numerical Analysis (Academic Press Inc., New York, 1966).