1. Radionuclides in ground-level air: Quarterly Results of Air Surveillance Programme—1st, 2nd, 3rd and 4th quarters 1987;Aaltonen,1987
2. Radionuclides in ground-level air: Quarterly Results of Air Surveillance Programme—1st, 2nd, 3rd and 4th quarters 1988: 1st, 2nd, 3rd and 4th quarters 1989;Aaltonen,1988
3. Environmental Radioactivity in Denmark in 1986;Aarkrog;Risø National Laboratory Report Risø-R-549,1988
4. Environmental Radioactivity in Denmark in 1987;Aarkrog;Risø National Laboratory Report Risø-R-563,1989
5. Aarkrog, A. (1989) Private communication. Risø National Laboratory, Roskilde, Denmark.