Anderson P W, 1971, J. Phys. C: Solid State Phys., 4, 607, 10.1088/0022-3719/4/5/011
Cardy J L, 1980, J. Phys. C: Solid State Phys., 13, 571, 10.1088/0022-3719/13/4/015
Dyson F J, 1969, Commun. Math. Phys., 12, 91, 10.1007/BF01645907
Dyson F J, 1969, Commun. Math. Phys., 12, 212, 10.1007/BF01661575
Kosterlitz J M, 1974, J. Phys. C: Solid State Phys., 7, 1046, 10.1088/0022-3719/7/6/005
10.1103/PhysRevLett.37.1577
Kosterlitz J M, 1973, J. Phys. C: Solid State Phys., 6, 1181, 10.1088/0022-3719/6/7/010