1. Y. Matsui: The Method of Lens Design (Kyoritsu Publishing Company, Tokyo, 1972) p. 13 (in Japanese).
2. Y. Matsui: The Aberration Theory (Japan Optoelectro-mechanics Association, Tokyo, 1989) p. 3 (in Japanese).
3. Y. Matsui: 3rd Order Aberration Theory with Small Decentorations (Japan Optoelectro-mechanics Association, Tokyo, 1989) p. 1 (in Japanese).
4. C. G. Wynne: Proc. Phys. Soc. Lond. B 67 (1954) 529.
5. T. A. Kuz’mina: Sov. J. Opt. Technol. 41 (1974) 434.