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Thorne, H. V., and Burrows, T. M., J. Hyg., 58, 409 (1960).
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BROOKSBY, J., SELLERS, R. & BRUCE, W. Filter Efficiency. Nature 228, 1237–1238 (1970). https://doi.org/10.1038/2281237c0
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DOI: https://doi.org/10.1038/2281237c0