Indian journal of pure and applied physics - New Delhi C.S.I.R. Publication and information directorate 1963 - vol.1, no.1 . Lib. has v.2(1964) -v.7 (1969), v.9 (1973)-v.16(1978), v.20 (1982)-v.39(2001) Universal Decimal Class. No.: 53(540)(05) / IND