Valkama, H., Martikainen, P., & Räty, M. (1997). First record of North American ambrosia beetle <i>Gnathotrichus materiarius</i> (Fitch) (Coleoptera, Scolytidae) in Finland - a new potential forest pest?. Entomologica Fennica, 8(4), 193–195. https://doi.org/10.33338/ef.83943