1. M. Cardona, Modulation Spectroscopy (Academic, New York, 1969; Mir, Moscow, 1972).
2. E. F. Venger, I. E. Matyash, and B. K. Serdega, Opt. Spektrosk. 94, 38 (2003) [Opt. Spectrosc. 94, 33 (2003)].
3. E. F. Venger, I. E. Matyash, and B. K. Serdega, Fiz. Tekh. Poluprovodn. (St. Petersburg) 37, 1188 (2003) [Semiconductors 37, 1160 (2003)].
4. I. E. Matyash and B. K. Serdega, Fiz. Tekh. Poluprovodn. (St. Petersburg) 38, 684 (2004) [Semiconductors 38, 657 (2004)].
5. F. P. Kesamanly, V. Yu. Rud’, and Yu. V. Rud’, Fiz. Tekh. Poluprovodn. (St. Petersburg) 33, 513 (1999) [Semiconductors 33, 483 (1999)].