Lif, M., Hjernquist, M., Olsson, O. and Österblom, H. (2005) “Long-term population trends in the Lesser Black-backed Gull Larus f. fuscus at Stora Karlsö and Lilla Karlsö, and initial results on breeding success”, Ornis Svecica. Lund, Sweden, 15(2), pp. 105–112. doi: 10.34080/os.v15.22745.