Iwajomo, S. B., A. Hedenström, and U. Ottosson. “Autumn Phenology and Morphometrics in the Garden Warbler Sylvia Borin at the Ottenby Bird Observatory, Sweden”. Ornis Fennica, vol. 89, no. 4, Dec. 2012, pp. 233–240, doi:10.51812/of.133811.