%0 Journal Article %A Fox, Sylvia M. %A Birnie, G. D. %A Martin, E. M. %A Sonnabend, J. A. %T Isolation of Polyoma Virus and Semliki Forest Virus from Tissue Culture Fluid by Continuous Flow Zonal Ultracentrifugation %D 1967 %J Journal of General Virology, %V 1 %N 4 %P 577-580 %@ 1465-2099 %R https://doi.org/10.1099/0022-1317-1-4-577 %I Microbiology Society, %X %U https://www.microbiologyresearch.org/content/journal/jgv/10.1099/0022-1317-1-4-577