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Thompson, Helen; Hunt, Lynn (1999). "Extrapolating from Honeybees to Bumblebees in Pesticide Risk Assessment". Ecotoxicology. 8 (3): 147–166. doi:10.1023/A:1026444029579. S2CID83289225.
Schmid-Hempel, R.; Schmid-Hempel, P. (1999). "Female Mating Frequencies in Bombus Spp. from Central Europe". Insectes Sociaux. 47: 36–41. doi:10.1007/s000400050006. S2CID40487899.