1. (1) JELMA Journal, 486, p. 6 (2007) (in Japanese).
2. (2) JELMA: SHOUMEI NI OKERU SHOU-ENE TEIAN, pp. 10-12 (2006) (in Japanese).
3. (3) Matsushita Electric Industrial Co., Ltd.: National RANPU SOGO KATAROGU (Catalog of Lamps) p. 20 (2006) (in Japanese).
4. (4) Nomoto, Y.: JELMA Journal, 481, pp. 22-24 (2006) (in Japanese).
5. (5) Kamata et al.: Characterization of radiant spectrum from tantalium microcavity radiator, Proc. Annual Conf. IEIJ, p. 41 (2006) (in Japanese).