1. Standard Methods for the Examination of Water and Wastewater;APHA,1971
2. The role of free radicals of oxygen in reactions produced by ionizing radiations;Barron;Radiation Res.,1954
3. Bacteriological methods for estimation of water pollution;Bonde;Health Lab. Sci.,1966
4. Determination of lethal activity of chlorine and ozone on E. coli;Bringman;Wat. Pollut.-Abs.,1955
5. New microbial indicators of wastewater chlorination efficiency;Engelbrecht;EPA-670/2-73/082,1974