1. Reinberg, A. R.; Fish, J. G. (U.S. 3814641 [1974]; CA. 81 [1974] No. 55743).
2. Hirokane, J.; Katayama, H.;Takahashi, A.;Inui,T.;Ohta, K.; Washo,J.;Miyake,T.;Van, K.; Mieda, M. (Eur. Appl. 234547 [1987]; CA. 108 [1988] No. 229639).
3. Naraoka, K.; Yanagisawa, H. (Japan. Kokai Tokkyo Koho 54–114306 [1978/79] from CA. 92 [1980] No. 32026).
4. Matsuzawa, T.; Yanagisawa, H.; Hashimoto, T. (Japan. Kokai Tokkyo Koho 60–40695 [1985] from CA. 104 [1986] No. 139322).
5. Cho LSI Gijutsu Kenkyu Kumiai (Japan. Kokai Tokkyo Koho 55–147628 [1979/80] from CA. 94 [1981] No. 165724).