1. On the superposition of renewal processes;Cox;Biometrika,1954
2. A limit theorem for flows of similar events;Ososkov;Theory Probab. Appl.,1956
3. Poisson-folyamat egy jemllemzese;Renyi;Ann. Math. Stat.,1956
4. Renewal theory and its ramifications;Smith;J. R. Stat. Soc. B,1958