1. Demonstration of a stimulation effect of natural and of very low radiation doses on cell multiplication;Planel,1979
2. The biological effect of the natural ionizing irradiation studied in a natural apparatus of radio protection;Planel;Stimulation Newsletter,1971
3. Hormesis with ionizing radiation;Luckey,1980
4. Radiation Hormesis;Luckey,1991
5. Investigation of radiation stimulation of tomatoes, onions and radishes in climatic chambers and field conditions;Shimon,1974