1. Afanas'ev, A.M. and Kohn, V.G., Fizika tverdogo tela (Solid State Physics), 1977, vol. 19, p. 1775.
2. Aristov, V.V., Polovinkina, V.I., Afanas’ev, A.M., and Kohn, V.G., Acta Cryst., 1980, vol. A36, p. 1002.
3. Indenbom, V.L., Slobodetskii, I.S., and Truni, K.G., Sov. Phys. JETP, 1974, vol. 39, no. 3, p. 542.
4. Levonyan, L.V., Pis’ma v
ZhTF, 1981, vol. 7, p. 269.
5. Ade, H., Ko, C.H., and Anderson, E., Applied Physics Letters, 1992, vol. 60, p. 1040.