3 ms·
here is the original paper: http://prl.aps.org/abstract/PRL/v111/i3/e033601 http://prl.aps.org/abstract/PRL/v111/i3/e033601
by jdmitch 13y ago
here is the original paper: http://prl.aps.org/abstract/PRL/v111/i3/e033601 http://prl.aps.org/abstract/PRL/v111/i3/e033601