The following are well-written reviews and background material for reference:
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- Després, Huffman, et al., Primary Biological Aerosol Particles in the Atmosphere: A Review
- Hamilton and Lenton, Spora and Gaia: how microbes fly with their clouds
- Möhler et al., Microbiology and atmospheric processes: the role of biological particles in cloud physics
- Szyrmer and Zawadzki, Biogenic and Anthropogenic Sources of Ice-Forming Nuclei: A Review