Åkesson, S., A. Hedenström, S. Bensch, and D. E. Irwin. “Blowfly Trypocalliphora Braueri (Diptera: Calliphoridae) Larvae Infestation in Willow Warblers Phylloscopus Trochilus Breeding in a Hybrid Zone”. Ornis Svecica, vol. 12, no. 1–2, Apr. 2002, pp. 83-88, doi:10.34080/os.v12.22840.