1. Avon, J. E., Woolley, J. C.: J. Appl. Phys. 52 (1981) 6423.
2. Aresti, A., Garbato, L., Geddo Lehmann, A., Manca, P.: Ternary Multinary Compd., Mater. Res. Soc. (1987) 497.
3. Jyh-rong Gong, Neff, H., Bachmann, K.J.: J. Electron. Mater. 17 (1988) 361.
4. Quintero, M., Grima, P., Avon, J.E., Lamarche, G., Woolley, J.C.: Phys. Status Solidi A 108 (1988) 599.
5. Dovletov, K.O., Nuryev, S., Khanberdiev, Y., Garagulov, O., Ragimov, F.D., Aleksanyan, S.N.: Izv. Akad. Nauk SSSR, Neorg. Mater. 25 (1989) 1218; Inorg. Mater. (Engl.Transl.) 25 (1989) 1028.