1 X.. Li, T.. Zhang, S.. Mukamel, R.P. Mirin, and S.T. Cundiff, Solid State Communications 149, (2009).
1 I.. Kuznetsova, P.. Thomas, T.. Meier, T.. Zhang, and S.T. Cundiff, Physica Status Solidi (c) 6, (2009).
1 W.. Zawadzki, P.. Pfeffer, R.. Bratschitsch, Z.. Chen, S.T. Cundiff, B.. Murdin, and C.. Pidgeon, Physical Review B 78, (2008).