by Hader, J., Tsuei-Lian Wang, Yarborough, J. M., Dineen, C. A., Kaneda, Y., Moloney, J. V., Kunert, B., Stolz, W., Koch, S. W.
Published in IEEE journal of selected topics in quantum electronics (01.11.2011)

by Dineen, Alison
Published in The Magazine antiques (1971) (01.07.1998)