1. E. W. Müller, Z. Phys. 131, 136 (1951).
2. Field-Ion Microscopy. Ed. D. J. Hren, S. Ranganathan (New York 1968).
3. H. D. Beckey, J. Mass. Spectr. Ion Phys. 2, 500 (1969).
4. I. V. Goldenfeld, R. N. Bpndarenko, V. G. Golovaty, Prib. Techn. Eksper., N. 3, 203 (1970).
5. A. C. Riviere, D. R. Sweetman, Proc. 3-rd Intern. Conf. Phys. Electron. Atomic Collisions. London 1963, p. 734.