Altered physiology in worker honey bees (Hymenoptera: Apidae) infested with the mite Varroa destructor (Acari: Varroidae): a factor in colony loss during overwintering ? - Amdam, Gro V.; Hartfelder, Klaus; Norberg, Kari; Hagen, Arne; Omholt, Stig W. (Journal of Economic Entomology, 2004)