1. 1) A.Azushima and K.Kitamura: Proc. of the 1986 Jpn. Spring Conf. for the Technol. Plast., Jpn. Soc. Technol. Plast., Tokyo, (1986), 151.
2. 2) A.Azushima, J.Kihara and I.Gokyu: J. Jpn. Soc. Technol. Plast., 19 (1978), 958.
3. 4) Y.Kasuga and K.Yamaguchi: Trans. Jpn. Soc. Mech. Eng., 33 (1967), 1294.
4. 5) T.Mizuno: J. Jpn. Soc. Technol. Plast., 12 (1971), 369.