Tellez, G.T., Nirmalakhadan, N., Gardea-Torresdey, J.L. The Study of PM10 and Heavy Metal Concentrations in Environmental Air Samples of Chihuahua City, Mexico. Ciencia en la Frontera, V, 5058. Kinetic Evaluation of a Field Scale Activated Sludge System for Removing Petroleum Hydrocarbons from Oilfield Produced Water. Environmental Progress 24(1), 96-104. 2005.