On the existence of positive solutions for semilinear elliptic equations with Neumann boundary conditions
1992 ◽
Vol 122
(1-2)
◽
pp. 137-160
2003 ◽
Vol 55
(1-2)
◽
pp. 167-186
◽
1982 ◽
pp. 133-155
◽
1987 ◽
Vol 98
(3)
◽
pp. 229-249
◽