1. G. M. Zhislin, Trudy Mosk. Mat. Obshch.9, 81–120 (1960).
2. J. E. Avron, J. W. Herbst, and B. Simon, Ann. Phys.,114, 431 (1978).
3. S. A. Vugalter and G. M. Zhislin, Teor. Mat. Fiz.,113, No. 3, 1547–1558 (1997).
4. G. Zhislin, In: A Tribute to Michail S. Birman, Amer. Math. Soc. 1998, pp. 275–285.
5. G. M. Zhislin, Teor. Mat. Fiz.,118, No. 1, 12–31 (1999).