Full paper in PDF:
$%R. Dalmasso, Positive radial solutions for semilinear biharmonic equations in annular domains, Rev. Mat. Univ. Complut. Madrid 6 (1993), no. 2, 279–294.%$

We study the existence of positive radial solutions of in an annulus with Dirichlet boundary conditions. We establish that the equation has at least one positive radially symmetric solution on any annulus if and are nonnegative, and is superlinear at zero and . We also give a property of positive radial solutions.

1991 Mathematics Subject Classification: 35B45, 35J40, 35J65.