scholarly journals Periodic solutions of wave equations with jumping nonlinearities

1980 ◽  
Vol 36 (1) ◽  
pp. 20-27 ◽  
Author(s):  
Michel Willem
1989 ◽  
Vol 62 (19) ◽  
pp. 2201-2204 ◽  
Author(s):  
Cecile DeWitt-Morette ◽  
See Kit Foong

1989 ◽  
Vol 40 (6) ◽  
pp. 639-644
Author(s):  
Yu. A. Mitropol'skii ◽  
G. P. Khoma

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