E. Laasonen and L. Laasonen, “Habitual differences of Phyllonorycter salictella (Zeller, 1846 ) and P. heringiella ( Grönlien, 1932) (Lepidoptera: Gracillariidae) in two Finnish materials; a problem pair”, Entomol. Fennica, vol. 11, no. 3, pp. 175–181, Sep. 2000, doi: 10.33338/ef.84063.