1. T. Otaki: Extended Abstract of the Japan Society of Applied Physics (60th Autumn Meeting, Kobe, 1999) p. 854 (in Japanese).
2. T. Otaki: Opt. Rev. 7 (2000) 119.
3. A. Mar#x00E9;chal and M. Francon: Diffraction—Structure des Images (Revue d#x0027;Optique Th#x00E9;orique et Instrumentale, Paris, 1960) Chap. 6, p. 71 (in French).
4. M. Francon: Progress in Microscopy (Pergamon Press, Oxford, 1961) Chap. 2, p. 64.
5. M. Born and E. Wolf: Principles of Optics (Pergamon Press, Oxford, 1980) 6th ed., p. 424.