Toivari L, Lindqvist O. The Marsh Warbler (Acrocephalus palustris) and Blyth´s Reed Warbler (Acrocephalus dumetorum) in the district of Lappeenranta, Summer 1960. Ornis Fenn. 1961;38(3–4):93–95. Accessed November 15, 2025. https://ornisfennica.journal.fi/article/view/132663