On projection operators and symmetry in quantum electronic systems.
Card's contents:602,635 BERRONDO MANUEL On projection operators and symmetry in quantum electronic systems. Uppsala 1973 Almqvist und Wiksell 8° s. nlb. 2, 9 + wkl. s. nlb. 2. Acta Universitatis Upsaliensis. Abstracts of Dissertations 261. Inaugural dissertation.