1. Combined scanning electron microscopy and image analysis to investigate airborne submicron particles: A comparison between personal samplers. L. Zamengo, N. Barbiero, M. Gregioa and G. Orrùa.
Chemosphere. Volume 76, Issue 3, July 2009, Pages 313-323
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http://dx.doi.org/10.1016/j.chemosphere.2009.03.065
Journal of Virological Methods. Volume 62, Issue 2, December 1996, Pages 153-159
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http://dx.doi.org/10.1016/S0166-0934(96)02100-3
The Journal of Immunology, 1962, 89, 279 -284.
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http://www.jimmunol.org/cgi/content/abstract/89/2/279
4. A Modified Method of Counting Particles. L. H. C. Tippett.
Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character, Vol. 137, No. 832 (Aug. 2, 1932), pp. 434-446.
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http://www.jstor.org/stable/95919