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2. Varroa jacobsoni (Acari: Varroidae) is more than one species;Anderson;Experimental and Applied Acarology,2000
3. A simulation model for the colonial development of Paravespula vulgaris and Dolichovespula sylvestris (Hymenoptera: Vespidae);Archer;Melanderia,1981
4. The occurrence of chronic and acute bee paralysis viruses in bees outside Britain;Bailey;Journal of Invertebrate Pathology,1965
5. Bailey , L. Ball , B.V. 1991 Honey Bee Pathology 2nd edn Academic Press