1. M. I. Bessonov, M. M. Koton, V. V. Kudryavtsev, and L. A. Laius, in Polyimides: A Class of Heat-Resistant Polymers, Ed. by M. I. Bessonov (Nauka, Leningrad, 1983) [in Russian].
2. F. N. Castellano, T. A. Heimer, and G. J. Meyer, Chem. Mater. 6, 1041 (1994).
3. K. Matsui and F. Momose, Chem. Mater. 9, 2588 (1997).
4. F. Momose, K. Maedo, and K. Matsui, J. Non-Cryst. Solids 244, 74 (1999).
5. V. I. Zemskii, A. V. Veresov, and L. Yu. Kolesnikov, Pis’ma Zh. Tekh. Fiz. 20(9), 74 (1994) [Tech. Phys. Lett. 20, 374 (1994)].