1. Reproduction in Paramecium as affected by small doses of X-ray and beta radiation;Daniel;Proc. Soc. Exptl. Biol. Med.,1953
2. The ecology, cultivation, structural characteristics and mating types of Paramecium calkinsi;Wichterman;Proc. Pa. Acad. Sci.,1951
3. Lethality and the biological effects of X-rays in Paramecium: Radiation resistance and its variability;Wichterman;Biol. Bull.,1954