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2. K.K. Shvarts, Yu.A. Ekmanis: Proc. Intern. Conf. Defects in Insulating Crystals, ed. by V.M. Tuchkevich, K.K. Shvarts (Springer, Berlin, Heidelberg 1981), pp. 363–386
3. Ch.B. Lushchik: Physics of Radiation Effects in Crystals, ed. by R.A. Johnson, A.N. Orlov (Elsevier, Amsterdam 1986), pp. 473–526
4. W.C Röntgen: Ann. Phys. 41, 449–498 (1913);
5. W.C Röntgen: ibid 64, 1–195 (1921)