1. Komori K, Kashihara K, Ogasawara K, Nozue A, Okada S. (Matsushita Electric Works, Ltd). U.S. Patent 6403690, 2002.
2. Nakamura Y, Asano T, Ogasawara KIN. (Matsushita Electric Works, Ltd). U.S. Patent 6645630, 2003.
3. Takahashi T, Uchida T, Fujioka AN. JP Kokai 10-30017 1998; CA 128:154846.
4. Takahashi T, Uchida T, Fujioka A. JP Kokai 10-30016 1998; CA 128:154845.
5. Yoshizawa M, Kobayashi N. JP Kokai 10-152545 1998; CA 129:41816.