1. Removal of viruses from water and waste-water;Berg,1971
2. Reassessment of the virus problem in sewage and in surface and renovated water;Berg,1972
3. Human enteric viruses in sewage;Clarke;Hlth. Lab. Sci.,1964
4. Water purification by forced-flow electrophoresis;Cooper,1965
5. Comparison of methods for concentration of the viral content of sewage and treated effluents;England,1971