Strength of the double-phonon state within an exactly solvable model

2002 ◽  
Vol 65 (3) ◽  
Author(s):  
Nguyen Dinh Dang
1979 ◽  
Vol 324 (1) ◽  
pp. 173-181 ◽  
Author(s):  
T. Fliessbach ◽  
P. Manakos

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