International Union of Pure and Applied Physics; Physikalische Gesellschaft der DDR, Berlin (German Democratic Republic); Akademie der Wissenschaften der DDR, Berlin. Zentralinstitut fuer Elektronenphysik; p. 553-554; 1977; p. 553-554; Physical Society of the GDR; Berlin; 13. international conference on phenomena in ionized gases; Berlin, German Democratic Republic; 12 - 17 Sep 1977; Published in summary form only.