Author: Lembcke, Jörn

Lembcke, Jörn: On infinitely many solutions of a semilinear elliptic eigenvalue problem. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 30 (1989), issue 4, pp. 727-731
Lembcke, Jörn: A set function without $\sigma$-additive extension having finitely additive extensions arbitrarily close to $\sigma$-additivity. (English). Czechoslovak Mathematical Journal, vol. 30 (1980), issue 3, pp. 376-381