12th general conference of the condensed matter division : [Praha 6-9 april 1992, European physical society, Union of Czechoslovak mathematicians and physicists - physical section [a] Institute of Physics Czechoslovak Academyof sciences : abstracts] / editors B. Velický, V. Vorlíček, K. Závěta.    Prague : Union of Czechoslovak Mathematicians and Physicists, 1992 . LII, 333, 14 s. . ISBN 80-7015-336-9