intercomparison of sampling techniques among five European laboratories for measurements of radiocaesium in upland pasture and soil / S.P.Nielsen,A.Aarkrog,P.A.Colgan и др., 1992. - 25 p. - Текст : непосредственный.
Environmental radioactivity in Denmark in 1990 and 1991 / A.Aarkrog,L.Botter-Jensen,C.Q.Jiang и др., 1992. - 173 p. - Текст : непосредственный.