Age-related resistance to avian leukosis virus. I. Influence of age at exposure on mortality and congenital transmission von Maas, H.J.L, Rispens, B.H, Groenendal, J.E, Vloten, J. van

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Control of Marek's disease in the Netherlands. I. Isolation of an avirulent Marek's disease virus (strain CVI 988) and its use in laboratory vaccination trials von Rispens, B.H, Vloten, H. van, Mastenbroek, N, Maas, H.J.L, Schat, K.A

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Some aspects of control of infectious hepatitis in ducklings von Rispens, B.H

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Control of Marek's disease in the Netherlands. II. Field trials on vaccination with an avirulent strain (CVI 988) of Marek's disease virus von Rispens, B.H, Vloten, H. van, Mastenbroek, N, Maas, H.J.L, Schat, K.A

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Tne NP activation test for assay of avian leukosis/sarcoma viruses von Rispens, B.H, Long, P.A, Okazaki, W, Burmester, B.R

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Isolation of an avian leukosis virus associated with the Harris strain of Rous sarcoma virus von Reamer, R.H, Okazaki, W.O, Rispens, B.H

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Quantitative pathogenicity of Marek's disease virus and vaccine virus strains in chickens: Macroscopical aspects von Maas, H.J.L., Orthel, F.W., Rispens, B.H., Tittes, E.V., De Kort, M.F., Vreede-Groenewegen, A.E., Jansen, J., Hartog, L.

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Some Virological and Serological Observations On Marek’s Disease: A Preliminary Report von Rispens, B.H., Van Vloten, J., Maas, H.J.L.

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