Valkama, H., Martikainen, P. and 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 (Dec. 1997), 193–195. DOI:https://doi.org/10.33338/ef.83943.