Beal A R, 1972, J. Phys. C: Solid St. Phys., 5, 3531, 10.1088/0022-3719/5/24/015
Bromley R A, 1972, J. Phys. C: Solid St. Phys., 5, 738, 10.1088/0022-3719/5/7/005
Bromley R A, 1972, J. Phys. C: Solid St. Phys., 5, 759, 10.1088/0022-3719/5/7/007
10.1016/0039-6028(77)90199-6
Bullett D W, 1977, J. Phys. C: Solid St. Phys., 10, 2083, 10.1088/0022-3719/10/12/014
Calais J-L, 1977, Adv. Phys., 26, 847, 10.1080/00018737700101473
10.1016/0025-5408(75)90100-2
Conroy L E, 1968, Inorg. Chem., 7, 459, 10.1021/ic50061a015
Doran N J, 1978, J. Phys. C: Solid St. Phys., 11, 685, 10.1088/0022-3719/11/4/012
10.1103/PhysRevLett.32.720
Friend R H, 1977, J. Phys. C: Solid St. Phys., 10, L705, 10.1088/0022-3719/10/24/006
10.1016/0022-3697(65)90043-0
Hughes H P, 1977, J. Phys. C: Solid St. Phys., 10, 1079, 10.1088/0022-3719/10/7/018
10.1016/0022-4596(71)90007-7
10.1103/PhysRevLett.30.1175
Krusius P, 1975, J. Phys. C: Solid St. Phys., 8, 3788, 10.1088/0022-3719/8/22/018
10.1016/0022-3697(69)90045-6
10.1103/PhysRevLett.29.1501
McTaggart F K, 1958, Aust. J. Chem., 11, 445, 10.1071/CH9580445
Murray R B, 1972, J. Phys. C: Solid St. Phys., 5, 746, 10.1088/0022-3719/5/7/006
Murray R B, 1972, J. Phys. C: Solid St. Phys., 5, 3038, 10.1088/0022-3719/5/21/009
Shepherd F R, 1974, J. Phys. C: Solid St. Phys., 7, 4416, 10.1088/0022-3719/7/23/028
Shepherd F R, 1974, J. Phys. C: Solid St. Phys., 7, 4427, 10.1088/0022-3719/7/23/029
10.1103/PhysRevLett.35.1786
10.1103/PhysRevLett.32.1241
10.1016/0038-1098(73)90569-3
Wexler G, 1976, J. Phys. C: Solid St. Phys., 9, 1185, 10.1088/0022-3719/9/7/010
Williams P M, 1976, vol 4
Williams P M, 1973, J. Phys. C: Solid St. Phys., 6, L36, 10.1088/0022-3719/6/1/011
Williams R H, 1973, J. Phys. C: Solid St. Phys., 6, L41, 10.1088/0022-3719/6/24/022
10.1103/PhysRevLett.32.882
Wilson J A, 1975, Adv. Phys., 24, 117, 10.1080/00018737500101391
Wilson J A, 1969, Adv. Phys., 18, 193, 10.1080/00018736900101307
10.1103/PhysRevLett.31.1400
Woolley A M, 1977, J. Phys. C: Solid St. Phys., 10, 2601, 10.1088/0022-3719/10/14/013
10.1103/PhysRevLett.40.1155