Institution: | (1) Mathematics and Physics Faculty, Charles University, Sokolovská 83, 186 00 Praha 8, Czechoslovakia;(2) Institute of Physics of the Atmosphere, Czechoslovakian Academy of Science, Bo ní II, 1401, 141 31 Praha 4, Czechoslovakia;(3) Mathematical Institute, Czechoslovakian Academy of Science, itná 25, 115 67 Praha 1, Czechoslovakia |