Brown, P.M.J., Roy, H.E., Rothery, P., Roy, D.B., Ware, R.L., Majerus, M.E.N., Roy, H.E. & Wajnberg, E. (2008) Harmonia axyridis in Great Britain: analysis of the spread and distribution of a non-native coccinellid. From Biological Control to Invasion: the Ladybird Harmonia axyridis as a Model Species pp. 55–67. Springer Netherlands.
Roy Helen E.
First name
Helen
Middle name
E.
Last name
Roy
Parrott, D., Roy, S., Baker, R., Cannon, R., Eyre, D., Hill, M.O., Wagner, M., Preston, C.D., Roy, H.E. & Beckmann, B. (2009) Horizon scanning for new invasive non-native animal species in England.
Saul, W.C., Roy, H.E., Booy, O., Carnevali, L., Chen, H.J., Genovesi, P., Harrower, C.A., Hulme, P.E., Pagad, S., Pergl, J. & Jeschke, J.M. (2017) Assessing patterns in introduction pathways of alien species by linking major invasion data bases. Journal of Applied Ecology, 54, 657–669.