Nontrivial periodic solutions of second order singular damped dynamical systems
2015 ◽
Vol 45
(2)
◽
pp. 457-474
◽
1991 ◽
Vol 90
(2)
◽
pp. 408-417
◽
2015 ◽
Vol 36
(2)
◽
pp. 643-652
◽
Keyword(s):
2019 ◽
Vol 58
(4)
◽
pp. 503-514
◽
2008 ◽
Vol 344
(2)
◽
pp. 898-905
◽
2009 ◽
Vol 111
(2)
◽
pp. 179-187
◽
1996 ◽
Vol 2
(3)
◽
pp. 315-331
◽