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Polak, M. F ,  Beunders, B. J. W ,  Werff, Albert van der ,  Sanders, E. W ,  Klaveren, J. N. van ,  Brans, L. M ,  World Health Organization. Expert Committee on Smallpox. Meeting (1964 : Geneva, Switzerland) ,  [A comparative study of clinical reaction observed after application of several smallpox vaccines in primary vaccination of young adults / M.F. Polak, B.J.W. Beunders, A.R. van der Werff, E.W. Sanders, J.N. van Klaveren & L.M. Brans]

Polak, M. F ,  World Health Organization. Expert Committee on Smallpox. Meeting (1964 : Geneva, Switzerland) ,  [The relation between potency of vaccine used in smallpox vaccination and immunity produced / by M.F. Polak]

Polak, M. F ,  World Health Organization. Expert Committee on Smallpox. Meeting (1964 : Geneva, Switzerland) ,  [Measures to be taken in case of outbreaks in countries free from smallpox / by M.F. Polak]

Polak, M. F ,  World Health Organization ,  International Assessment of Smallpox Eradication in Indonesia (1974) ,  [Smallpox control in Indonesia during the second quarter of the century and re-establishment of endemic smallpox from 1947 / by M.F. Polak]

Polak, M. F ,  Beunders, B. J. W ,  Werff, Albert van der ,  Sanders, E. W ,  Klaveren, J. N. van ,  Brans, L. M ,  World Health Organization. Expert Committee on Smallpox. Meeting (1964 : Geneva, Switzerland) ,  [A comparative study of clinical reaction observed after application of several smallpox vaccines in primary vaccination of young adults / M.F. Polak, B.J.W. Beunders, A.R. van der Werff, E.W. Sanders, J.N. van Klaveren & L.M. Brans]

Polak, M. F ,  World Health Organization. Expert Committee on Smallpox. Meeting (1964 : Geneva, Switzerland) ,  [The relation between potency of vaccine used in smallpox vaccination and immunity produced / by M.F. Polak]

Polak, M. F ,  World Health Organization. Expert Committee on Smallpox. Meeting (1964 : Geneva, Switzerland) ,  [Measures to be taken in case of outbreaks in countries free from smallpox / by M.F. Polak]

Polak, M. F ,  World Health Organization ,  International Assessment of Smallpox Eradication in Indonesia (1974) ,  [Smallpox control in Indonesia during the second quarter of the century and re-establishment of endemic smallpox from 1947 / by M.F. Polak]