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Otterbeck, A., Dale, S., Lindén, A. and Marthinsen, G. 2013. A male Reed Warbler and Marsh Warbler hybrid (Acrocephalus scirpaceus × A. palustris) in Norway documented with molecular methods. Ornis Norvegica. 36, (Jun. 2013), 6-13. DOI:https://doi.org/10.15845/on.v36i0.351.