Tauc, 1970, Bull. Am. Phys. Soc., 15, 553
A. Menth, F. J. Di Salvo and J. Tauc, Phys. Rev. (to be published).
Červinka, 1970, J. Non-Crystalline Solids, 4, 258, 10.1016/0022-3093(70)90050-5
Brodsky, 1969, Phys. Rev. Letters, 23, 581, 10.1103/PhysRevLett.23.581
Tauc, 1970, Mater. Res. Bull., 5, 721, 10.1016/0025-5408(70)90112-1
Davis, 1970, Phil. Mag., 22, 903, 10.1080/14786437008221061
Tauc, 1970, Phys. Rev. Letters, 25, 749, 10.1103/PhysRevLett.25.749
D. L. Wood and J. Tauc, Phys. Rev., in press.
Young, 1971, J. Phys. C, 4, 93, 10.1088/0022-3719/4/1/013
E. A. Fagen, S. H. Holmberg, R. W. Seguin and J. C. Thompson, to be published.
E. A. Fagen, private communication.
M. H. Cohen, private communication.
Tauc, 1966, Phys. Status Solidi, 15, 627, 10.1002/pssb.19660150224
Elliott, 1957, Phys. Rev., 108, 1384, 10.1103/PhysRev.108.1384
Eagles, 1960, J. Phys. Chem. Solids, 16, 76, 10.1016/0022-3697(60)90075-5
Fischer, 1971, Opt. Commun., 3, 116, 10.1016/0030-4018(71)90192-1
Hopfield, 1968, Comments Solid State Phys., 1, 16
Dow, 1971, Phys. Rev. Letters, 26, 762, 10.1103/PhysRevLett.26.762
Redfield, 1965, Phys. Rev., 140, A2056, 10.1103/PhysRev.140.A2056
Dexter, 1967, Phys. Rev. Letters, 19, 1383, 10.1103/PhysRevLett.19.1383
Inglis, 1970, Phys. Rev. Letters, 25, 10.1103/PhysRevLett.25.1275
Dow, 1970, Phys. Rev., 8, 3358, 10.1103/PhysRevB.1.3358
Morgan, 1965, Phys. Rev., 139, A343, 10.1103/PhysRev.139.A343
Böer, 1970, Phys. Rev., 24, 230
Bagley, 1970, Solid State Commun., 8, 345, 10.1016/0038-1098(70)90464-3
P. Nielsen, to be published.
Fritzsche, 1971, J. Non-Crystalline Solids, 6, 49, 10.1016/0022-3093(71)90015-9
D. L. Wood, A. Menth and J. Tauc, to be published.
Dow, 1972, J. Non-Crystalline Solids, 8–10, 664, 10.1016/0022-3093(72)90208-6
Spicer, 1972, J. Non-Crystalline Solids, 8–10, 122, 10.1016/0022-3093(72)90124-X
Fischer, 1972, J. Non-Crystalline Solids, 8–10, 202, 10.1016/0022-3093(72)90137-8
Camphausen, 1972, J. Non-Crystalline Solids, 8–10, 223, 10.1016/0022-3093(72)90140-8
Connell, 1972, J. Non-Crystalline Solids, 8–10, 215, 10.1016/0022-3093(72)90139-1
Shevchik, 1972, J. Non-Crystalline Solids, 8–10, 381, 10.1016/0022-3093(72)90164-0
Kosek, 1970, Czech. J. Phys., B20, 94, 10.1007/BF01698111