1. 1) R. N. ORAVA and H. E. OTTO: J. Metals, (1970) Feb., p.17
2. 2) T. von KARMAN and P. DUWEZ: J. Appl. Phys., 21 (1960) 8, p.989
3. 3) C. H. CHIANG: J. Inst. Metals, 98 (1970), p.78
4. 6) H. KOLSKY: Stress Waves in Solid, (Oxford) 1953, p.31
5. 8) H. KOLSKV: Stress Waves in Solid, (Oxford), 1953, p.31