1. T. Pennet, Eur. Patent No. 263, 552 (1986).
2. T. Pennet, Belg. Patent No. 905, 981 (1986).
3. J. Kaloustian, A. M. Pauli and J. Pastor, Analusis, 15 (1987) 101.
4. J. Kaloustian, A. M. Pauli and J. Pastor, J. Thermal Anal., 34 (1988) 465.
5. J. Kaloustian, A. M. Pauli and J. Pastor, Proceedings of the 15th JEEP (Grenoble), (1989) 63.