Svanberg, S., and J. Waldenström. “Population Fluctuations and Timing of Spring Migration of the Scandinavian Bluethroat Luscinia Svecica Svecica at Ottenby Bird Observatory, Sweden, 1955–2008”. Ornis Svecica, vol. 21, no. 2–4, Apr. 2011, pp. 92–100, doi:10.34080/os.v21.22603.