1. Gardner, S. D., A. M. Field, D. V. Coleman, andB. Hulme: New human papovavirus (B.K.) isolated from urine after renal transplantation. Lanceti, 1953?1957 (1971).
2. Lecatsas, G., O. W. Prozesky, J. van Wyk, andH. J. Els: Papovavirus in urine after renal transplantation. Nature (Lond.)241, 343?344 (1973).
3. Padgett, B. L., D. L. Walker, G. M. Zurhein, R. J. Eckroade, andB. H. Dessel: Cultivation of papova-like virus from human brain with progressive multifocal leucoencephalopathy. Lanceti, 1257?1260 (1971).
4. Schmidt, N. J.: Tissue culture techniques. In: Diagnostic Procedures for Viral and Rickettsial Infections, 4th edit., p. 104 (E. H. Lenette andN. J. Schmidt, eds.). New York: American Public Helath Association Inc., 1969.
5. Prozesky, O. W., C. Britz, andW. O. K. Grabow:In vitro culture of cell lines from Australia antigen positive and negative hepatoma patients. In: Liver, p. 358 (S. J. Saunders andJ. Terblanche, eds.). London: Pitman Medical, 1973.