1. GRUZDEV, B. I. (1965). The accumulation of uranium, radium and thorium by some plants and the distribution of these elements in the system: soil-plant in some natural phytocenosis. The thesis of the reports, part 3, Petrosavodsk.
2. HULTQVIST, B. (1959). Ionizing Radiation of Natural Radioelements, IL Moscow.
3. MASLOV, V. I. (1965). The peculiarities of inhabiting of populations of wild animals in the area with increased uranium and radium content in the soil. The thesis of the reports made of the all Union conference of the high schools on the problems of microelements and natural radioactivity, part 3, Petrosavodsk.
4. OVCHENKOV, V.J., and NIKIFOROV, V. S., (1965). Vacuum method of determination of radon in the burrows of the digging animals. Theses of the report. The materials of Komi youth conference. Syktyvkar.
5. RUBTSOV, D. M. (1965). The distribution of radioactive elements (uranium, radium, thorium) in mountain-podzolic soil. The thesis of the reports, part 3, Petrosavodsk.