1. For a review, seeMagnetostructural Correlations in Exchange Coupled Systems, edited by R. D. Willett, D. Gatteschi, and O. Kahn, NATO ASI Series C140 (Reidel, Dordrecht, Netherlands, 1985), p. 400 and references therein.
2. For a review, seePhysics and Chemistry of Materials with Low-Dimensional Structures, edited by L. J. de Jongh (Kluwer, Dordrecht, Netherlands, 1990), Vol. 9, p. 1 and references therein.
3. Experimental susceptibilities of quasi-two-dimensional Heisenberg ferromagnets, compared with high-temperature series expansion analyses
4. Kosterlitz-Thouless transition in (CH3NH3)2. CuCl4
5. Magnetic and optical properties of the layer type magnets (CH2)2(ND3)2MnCl4 and (CH2)n(NH3)2CuCl4, n = 2, 3, 5