Reproduction of material from the journal in any form requires written permission of the publisher.
Teachers, students and researchers can individually use the materials on Physics-Uspekhi website for noncommercial use in a teaching or research activities.
Оригинал: Альтшулер Л В «Успехи физики высоких давлений» УФН 100 721–723 (1970); DOI: 10.3367/UFNr.0100.197004f.0721