Boundary value problem for differential and difference second order systems Janusz Traple — 1977 Annales Polonici Mathematici
Positive solutions of a renewal equation Janusz Traple — 1992 Annales Polonici Mathematici An existence theorem is proved for the scalar convolution type integral equation x ( t ) = ∫ - ∞ ∞ h ( t - s ) f ( s , x ( s ) ) d s .