APA
Arora Ravinder Kumar, University of Delhi. Faculty of Science. Department of Physics and Astrophysics & University of Delhi. Faculty of Science. Department of Physics and Astrophysics. (1969). Variational technique. : .
Chicago
Arora Ravinder Kumar, University of Delhi. Faculty of Science. Department of Physics and Astrophysics and University of Delhi. Faculty of Science. Department of Physics and Astrophysics. 1969. Variational technique. : .
Harvard
Arora Ravinder Kumar, University of Delhi. Faculty of Science. Department of Physics and Astrophysics and University of Delhi. Faculty of Science. Department of Physics and Astrophysics. (1969). Variational technique. : .
MLA
Arora Ravinder Kumar, University of Delhi. Faculty of Science. Department of Physics and Astrophysics and University of Delhi. Faculty of Science. Department of Physics and Astrophysics. Variational technique. : . 1969.