Soon-Mo Jung
Hyers-Ulam-Rassias stability of functional equations in nonlinear analysis
Aleksandrov-Rassias Problems on Distance Preserving Mappings
Günstige Überdeckung von kompakten Mengen
Hyers-Ulam-Rassias Stability of Functional Equations in Mathematical Analysis
Ulam's Conjecture on Invariance of Measure in the Hilbert Cube