1. [1] S. Tokita, J. Comput. Chem. Jpn, 15, A38–A41 (2015); in Japanese; http://doi.org/10.2477/jccj.2015-0014
2. [2] T. Azumi, "Gakubu Gakusei no Tameno Ryosi Kagaku Kogi Noto, Zenpen (Lecture Note on Quantum Chemistry, Part 1)", in Japanese: Molecular Science Vol. 5 (2011) No. 1, Archives, PAC0005, p. 313 (Chapter 5, p. 25). https://www.jstage.jst.go.jp/browse/molsci/5/1/_contents.
3. [3] G. L. Breneman, J. Chem. Educ., 65, 31 (1988).
4. [4] S. Tokita, Gendai Kagaku, No. 213, p. 50–55 (1988(12)), in Japanese
5. [5] S. Tokita, Kagaku (Kyoto), 65, 26 (2010), in Japanese.