PRAKASH, SATYA creator text NEW DELHI PRAGATI 2016 9TH monographic 532 PHYSICS & WAVES MECHANICS FREE OSCILLATIONS IN ONE - DIMENSION : SIMPLE HARMONIC OSCILLATOR, DAMPED HARMONIC OSCILLATOR, COUPLED OSCILLATOR, FOURIER'S THEOREM, WAVES IN SOLID, LISSAJOUS' FIGURES, DOPPLER'S EFFECT, ELEMENTARY THEORY OF FILTERS, ULTRASONIC , ELECTROMAGNETIC WAVES 530.124, PRA 9789351403999