3 ms·
I think this is it: http://www.jetp.ac.ru/cgi-bin/dn/e_022_02_0378.pdf http://www.jetp.ac.ru/cgi-bin/dn/e_022_02_0378.pdf
by gilbetron 7y ago
I think this is it: http://www.jetp.ac.ru/cgi-bin/dn/e_022_02_0378.pdf http://www.jetp.ac.ru/cgi-bin/dn/e_022_02_0378.pdf