C. S. Owen, 1972, Phys. Rev. Lett., 28, 1559, 10.1103/PhysRevLett.28.1559
Jhy-Jiun Chang, 1974, Phys. Rev. B, 9, 4769, 10.1103/PhysRevB.9.4769
Jhy-Jiun Chang, 1974, Phys. Rev. B, 10, 4047, 10.1103/PhysRevB.10.4047
W. H. Parker, 1972, Phys. Rev. Lett., 29, 924, 10.1103/PhysRevLett.29.924
W. H. Parker, 1974, Solid State Commun., 15, 1003, 10.1016/0038-1098(74)90518-3
A. Rothwarf, 1974, Phys. Rev. Lett., 33, 212, 10.1103/PhysRevLett.33.212
G. A. Sai-Halasz, 1974, Phys. Rev. Lett., 33, 215, 10.1103/PhysRevLett.33.215
P. Hu, 1974, Phys. Rev. B, 10, 2786, 10.1103/PhysRevB.10.2786
A. Rothwarf, 1967, Phys. Rev. Lett., 19, 27, 10.1103/PhysRevLett.19.27
A. R. Long, 1973, Philos. Mag., 27, 865, 10.1080/14786437308227566
W. A. Little, 1959, Can. J. Phys., 37, 334, 10.1139/p59-037
L. R. Testardi, 1971, Phys. Rev. B, 4, 2159, 10.1103/PhysRevB.4.2189