%0 Journal Article %A Timmermans, A. %A Bentvelzen, P. %A Hageman, Philomena C. %A Calafat, Jero %T Activation of a Mammary Tumour Virus in O20 Strain Mice by X-irradiation and Urethane %D 1969 %J Journal of General Virology, %V 4 %N 4 %P 619-621 %@ 1465-2099 %R https://doi.org/10.1099/0022-1317-4-4-619 %I Microbiology Society, %X %U https://www.microbiologyresearch.org/content/journal/jgv/10.1099/0022-1317-4-4-619