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- [2] COHERENT EXCHANGE CLUSTER APPROACH FOR 2-DIMENSIONAL DISORDERED HEISENBERG-SPIN SYSTEM .3. DILUTE FERROMAGNET AND ANTIFERROMAGNETS ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER, 1975, 21 (02): : 157 - 163
- [3] COHERENT EXCHANGE CLUSTER CALCULATIONS FOR ANTIFERROMAGNETIC DISORDERED SYSTEMS ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER, 1976, 24 (04): : 417 - 424
- [8] EQUILIBRIA OF 2-DIMENSIONAL SYSTEMS .2. JOURNAL OF PHYSICAL CHEMISTRY, 1945, 49 (05): : 411 - 417