Electrons in crystalline solids. Lectures presented at an international course at Trieste from 10 January to 15 April 1972, organized by the International Centre for Theoretical Physics, Trieste. International Centre for Theoretical Physics. Energy-band theory of solids Congresses. QC176.8.E4 E38 539.7 UNE "STI/PUB/335" Includes bibliographical references. Vienna, International Atomic Energy Agency, 1973. 1973. 1973 Text 753 p. eng