References
Grešíová, M., Acta Virologica, 2, 133 (1958).
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GREŠÍKOVÁ, M., ALBRECHT, P. & ERNEK, E. Comparison of an Attenuated and Virulent Louring Ill Strain. Nature 190, 508–510 (1961). https://doi.org/10.1038/190508a0
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DOI: https://doi.org/10.1038/190508a0
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