Phases of Two-Dimensional Heisenberg Spin Systems from Strong-Coupling Expansions

1978 ◽  
Vol 41 (20) ◽  
pp. 1337-1340 ◽  
Author(s):  
C. J. Hamer ◽  
J. B. Kogut ◽  
L. Susskind
1981 ◽  
Vol 23 (9) ◽  
pp. 4698-4708 ◽  
Author(s):  
Herbert W. Hamber ◽  
John L. Richardson

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