Makepeace, J L; Altzitzoglou, T*; Cassette, P*; Dryak, P*; Gunter, E*; Hurtgen, C*; Radoszewski, T*; Simpson, B*; Unterweger, M P* (1998) International comparison of measurements of the specific activity of tritiated water. Appl. Radiat. Isot., 49 (9-11). pp. 1411-1416.