“…However, non thermal effects have been suggested and there is still a great deal of controversy on this subject (Michaelson et al 1967, Cleary 1970, Milroy et al 1971, Roth 1968, Dodge et al 1966, Presman 1965, Presman 1970, Turner 1962, Dodge 1965, Gordon 1960, Tolgskaya et al 1960, Osipov 1965, Livshits 1957, Livshits 1967, Gorodetskaia 1963, Gorodetskaia 1964, Kevorkyan 1948, Levitina 1964, Lobanova 1960, Minecki 1961a, b, Presman et al 1961, Sadchikova et al 1958, Subbota 1957, Tyagiii 1957, Vavala 1968). However, non thermal effects have been suggested and there is still a great deal of controversy on this subject (Michaelson et al 1967, Cleary 1970, Milroy et al 1971, Roth 1968, Dodge et al 1966, Presman 1965, Presman 1970, Turner 1962, Dodge 1965, Gordon 1960, Tolgskaya et al 1960, Osipov 1965, Livshits 1957, Livshits 1967, Gorodetskaia 1963, Gorodetskaia 1964, Kevorkyan 1948…”