1. Barrie, L.A., Anlauf, K.G., Wiebe, H.A., and Fellin, P.: 1984, Acid Precipitation Series, Vol. 4, J. Teasely (ed.), Ann Arbor Science, 15.
2. Bowersox, V.C., Lynch, J.A., and Grimm, J.G.: 1995, Proc. 88th Annual Mtg., Air and Waste Management Assoc. Pittsburgh, PA, U.S.A.
3. Brydges, T.G. and Summers, P.W.: 1989, Water, Soil and Air Pollut., 43, 249?263.
4. CAPMoN.: 1989, CAPMoN Precipitation Chemistry Data Summary ? 1987, Atmospheric Environment Service, Environment Canada, Report No. ARD 89-1, January 1989.
5. Hedin, L.O., Granat, L., Likens, G.E., Buishand, T.A., Galloway, J.N., Butler, T.J., and Rodhe, H.: 1994, Nature, 367, 351?354.