Laasonen, Erkki, and Leena Laasonen. 2000. “Habitual Differences of <i>Phyllonorycter salictella</i> (Zeller, 1846 ) and <i>P. heringiella</i> ( Grönlien, 1932) (Lepidoptera: Gracillariidae) in Two Finnish Materials; A Problem Pair”. Entomologica Fennica 11 (3):175-81. https://doi.org/10.33338/ef.84063.