Ground-state energies of the nonlinearσmodel and the Heisenberg spin chains

1989 ◽  
Vol 63 (10) ◽  
pp. 1110-1113 ◽  
Author(s):  
Shoucheng Zhang ◽  
H. J. Schulz ◽  
Timothy Ziman
2015 ◽  
Vol 143 (24) ◽  
pp. 244308 ◽  
Author(s):  
Edoardo Fertitta ◽  
Muammar El Khatib ◽  
Gian Luigi Bendazzoli ◽  
Beate Paulus ◽  
Stefano Evangelisti ◽  
...  

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