@article {berk2006occurrence, title = {Occurrence of infected amoebae in cooling towers compared with natural aquatic environments: implications for emerging pathogens}, journal = {Environmental science \& technology}, volume = {40}, number = {23}, year = {2006}, pages = {7440{\textendash}7444}, publisher = {ACS Publications}, author = {Berk, SG and Gunderson, JH and Newsome, AL and Farone, AL and Hayes, BJ and Redding, KS and Uddin, N and Williams, EL and Johnson, RA and Farsian, M and others} }