[1] E. N. DANCER: On the Dirichlet problem for weakly nonlinear elliptic partial differential equations. (to appear).
[2] S. FUČÍK:
Nonlinear equations with noninvertible linear part. Czechoslovak Math. J. 24 (1974), 467-495.
MR 0348568
[3] S. FUČÍK:
Further remark on a theorem by E. M. Landesman and A. C. Lazer. Comment. Math. Univ. Carolinae 15 (1974), 259-271.
MR 0348260
[4] S. FUČÍK M. KUČERA J. NEČAS:
Ranges of nonlinear asymptotically linear operators. J. Diff. Equations 17 (1975), 375-394.
MR 0372696
[5] J. I. KAZBAN F. W. WARNER:
Remarks on some quasilinear elliptic equations. Communications Pure Appl. Math. 28 (1975), 567-597.
MR 0477445
[6] E. M. LANDESMAN A. C. LAZER:
Nonlinear perturbations of linear boundary value problems at resonance. J. Math. Mech. 19 (1970), 609-623.
MR 0267269
[7] J. NEČAS:
On the range of nonlinear operators with linear asymptotes which are not invertible. Comment. Math. Univ. Carolinae 14 (1973), 63-72.
MR 0318995