MAP20130018799 Fraas, Art Reply to letter by Fann, Lamson, Anenberg, and Hubbell, regarding Fraas & Lutter Article : Uncertain benefits estimates for reductions in fine particle concentrations / Art Fraas and Randall Lutter En: Risk analysis : an international journal. - McLean, Virginia : Society for Risk Analysis, 1987-2015 = ISSN 0272-4332. - 01/05/2013 Volumen 33 Número 5 - mayo 2013 I. Lutter, Randall . II. Título.