Multiple periodic solutions for first-order ordinary differential equations
1987 ◽
Vol 127
(2)
◽
pp. 459-469
◽
Keyword(s):
Keyword(s):
2011 ◽
Vol 218
(5)
◽
pp. 1605-1610
◽
1987 ◽
Vol 38
(2)
◽
pp. 257-265
◽
Keyword(s):
1998 ◽
Vol 50
(3)
◽
pp. 400-407
◽
Keyword(s):
Keyword(s):