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4. Dulbecco, R., andM. Vogt: Plaque formation and isolation of pure line with poliomyelitis viruses. J. exp. Med.99, 167?182 (1954).
5. Yoshino, K., H. Taniguchi, andS. Taniguchi: Titration of herpes simplex virus in one-day eggs by an improved inoculation method and its application to the serum neutralization test. J. Immunol.83, 246?251 (1959).