Wegrzyn, E., K. Leniowski, and T. S. Osiejuk. “Introduce Yourself at the Beginning – Possible Identification Function of the Initial Part of the Song in the Great Reed Warbler Acrocephalus Arundinaceus”. Ornis Fennica, vol. 86, no. 2, July 2009, pp. 61–70, https://ornisfennica.journal.fi/article/view/133722.