1. Environmental Radioactivity at Risø, April 1, 1957–March 31, 1958, RISO-3;Aarkrog,1958
2. Environmental Radioactivity at Risø, April 1, 1958–March 31, 1959, RISO-9;Aarkrog,1959
3. A summary of radiochemical analyses made on fall-out samples gathered during the period 1957–59 at Risø;Aarkrog;Svensk Kem. Tidskr.,1959
4. Environmental Studies on Radioecological Sensitivity and Variability: With Special Emphasis on the Fallout Nuclides Sr-90 and Cs-137;Aarkrog,1979
5. GIS supported calculations of Cs-137 deposition in Sweden based on precipitation data;Almgren;Sci. Total Environ.,2006