TY - BOOK AU - Trehan Ramesh Kumar AU - University of Delhi. Faculty of Science. Department of Physics and Astrophysics ED - University of Delhi. Faculty of Science. Department of Physics and Astrophysics TI - Study of O(2,1) and O(3) representations and their applications to hydorgen problem and isotropic harmonic oscillator PY - 1970/// KW - PHYSICS ER -