1. Transmission of viruses by the water route;BERG,1967
2. Integrated approach to the problem of viruses in water;BERG;J. san. Engng Div. Amer. Soc. Civ. Engrs,1971
3. Recovery of small quantities of viruses from clean water on cellulose nitrate membrane filters;BERG;Appl. Microbiol.,1971
4. Removal of viruses from sewage, effluents, and waters. — 1. A review;BERG;Bull. Wld Hlth Org.,1973
5. Removal of viruses from sewage, effluents, and waters. — 2. Present and future trends;BERG;Bull. Wld Hlth Org.,1973