by Evans, G.A., Bour, D.P., Carlson, N.W., Amantea, R., Hammer, J.M., Lee, H., Lurie, M., Lai, R.C., Pelka, P.F., Farkas, R.E., Kirk, J.B., Liew, S.K., Reichert, W.F., Wang, C.A., Choi, H.K., Walpole, J.N., Butler, J.K., Ferguson, W.F., DeFreez, R.K., Felisky, M.
Published in IEEE journal of quantum electronics (01.06.1991)