Eigenvalue problems for nonlinear second order differential equations
1975 ◽
pp. 294-306
1962 ◽
Vol 16
(79)
◽
pp. 338-338
◽
1979 ◽
Vol 19
(3)
◽
pp. 64-73
1980 ◽
Vol 49
(1)
◽
pp. 376-384
◽
2011 ◽
Vol 57
(2)
◽
pp. 409-416
2015 ◽
Vol 36
(7)
◽
pp. 930-941