1. J. Wu, J. W. Ager, K. M. Yu, and W. Walukiewicz, Cond. Matter 1(3), 1 (2003).
2. V. M. Koshkin and Yu. N. Dmitriev, Chemistry and Physics of Compounds with Loose Crystal Structure (Harwood Acad. Publ., Swizerland, 1994), Chem. Rev. Ser.
3. J. C. Bernede and S. Marsillac, Mater. Res. Bull. 37, 1193 (1997).
4. S. I. Drapak, V. V. Netyaga, and Z. D. Kovalyuk, Pis’ma Zh. Tekh. Fiz. 28(17), 8 (2002) [Tech. Phys. Lett. 28, 711 (2002)].
5. V. P. Savchun and V. B. Kytsai, Thin Solid Films 361–362, 123 (2000).