1. Méndez-Tejeda, R.; Penalbert, J. Acid Rain in Carolina, Puerto Rico;Environ. Health Sci. 2001, available on-line in February.
2. Méndez-Tejeda, R.; Penalbert, J.; Rodriguez, M. Analysis of pH in Wet Deposition in Northeastern Puerto Rico; submitted for publication, 2001.
3. Osbone, E. Acid Rain in Puerto Rico. InSouthern Topics;EPA 600/979036; U.S. Environmental Protection Agency: July 1990.
4. Pio, C.A.; Salgeiro, M.L.; Nunes, T.V. Seasonal and Air-Mass Trajectory Effects on Rainwater Quality at the Southwestern Europe Border; 1991,25(A), 2259-2266.
5. Rua, A.; Hernandez, E.; de las Parras, J.; Martin, I.; Gimeno, L. Sources of SO2, SO42−, NOx, and NO3−in the Air of Four Spain Remote Stations;J. Air & Waste Manage. Assoc.1998,48, 838-845.