Existence of positive periodic solutions of periodic boundary value problem for second order ordinary differential equations
2010 ◽
Vol 129
(1-2)
◽
pp. 166-181
◽
2017 ◽
Vol 24
(1)
◽
pp. 29-39
◽
1995 ◽
Vol 18
(4)
◽
pp. 757-764
◽
2019 ◽
Vol 22
(06)
◽
pp. 1950049
2007 ◽
Vol 193
(2)
◽
pp. 560-571
◽
2004 ◽
Vol 155
(3)
◽
pp. 709-726
◽