1. Schwerdt, C. E., andF. L. Schaffer: Purification of poliomyelitis viruses propagated in tissue culture. Virology2, 665 (1956).
2. Mayer, M. M., H. J. Rapp, B. Roizman, S. W. Klein, K. M. Cowan, D. Lukens, C. E. Schwerdt, F. L. Schaffer, andJ. Charney: The purification of poliovirus as studied by complement-fixation. J. Immunol.78, 435 (1957).
3. Schwerdt, C. E.: Nucleic Acids and Viruses, Publication of the New York Academy of Sciences No. 5. Cellular Biology, New York, 1957.
4. Roizman, B., M. M. Mayer, andH. J. Rapp: Immunochemical studies on poliovirus. III. Further studies on the immunologic and physical properties of poliovirus particles produced in tissue culture. J. Immunol.81, 419 (1958).
5. Le Bouvier, G. L.: The modification of poliovirus by heat and ultraviolet light. LancetII, 1013 (1955).