lectures given by J. Hamilton, at the Niels Bohr Institute and NORDITA, Copenhagen ; notes prepared with the help of Jens Lyng PetersenNORDITA (Nordisk institut for teoretisk atomfysik)c1967-1968
lectures given by J. Hamilton, at the Niels Bohr Institute and NORDITA, Copenhagen ; notes prepared with the help of Jens Lyng PetersenNORDITA (Nordisk institut for teoretisk atomfysik)1966, c1967