BASIC MECHANISMS OF SOLAR Activity. Ed. BY V. BUMBA AND J. Kleczek. SYMPOSIUM HELD IN Prague, Czechoslovakia, 25-29 AUGUST 1975

V.BUMBA, J.KLECZEK, Vaclav Bumba, Josip Kleczek, International Astronomical Union, Union Astronomique Internationale, edited by V. Bumba, J.