1. Ott, W.R.; Mage, D.T.; Randercker, V.W. Testing the Validity of the Lognormal Probability Model: Computer Analysis of Carbon Monoxide Data from U.S. Cities; EPA 600/4-79-040; U.S. Environmental Protection Agency: Research Triangle Park, NC, 1979.
2. Press, W.H.; Teukolsky, S.A.; Vetterling, W.T.; Flannery, B.M. Numerical Recipes: The Art of Scientific Computing; Cambridge Universal Press: New York, 1992; pp 678-682.