Monotonicity in the damped pendulum type equations

2008 ◽  
Vol 60 (5) ◽  
pp. 823-839 ◽  
Author(s):  
Pei-Lin Zhang ◽  
Xin Ma ◽  
Zhi-Long Peng ◽  
Wen-Xin Qin
2013 ◽  
Vol 25 (3) ◽  
pp. 627-652 ◽  
Author(s):  
Alessandro Margheri ◽  
Carlota Rebelo ◽  
Fabio Zanolin

2000 ◽  
Vol 249 (2) ◽  
pp. 445-462 ◽  
Author(s):  
Petr Girg ◽  
Francisco Roca

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