Engesgaard, Peter, Højberg, Anker L, Hinsby, Klaus, Jensen, Karsten H, Laier, Troels, Larsen, Flemming, Busenberg, Eurybiades, and Plummer, L Niel, 2004, Transport and Time Lag of Chlorofluorocarbon Gases in the Unsaturated Zone, Rabis Creek, Denmark: Vadose Zone Journal, v. 3, iss. 4, p. 1249-1261.