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Hansen EM, Brasier CM, Shaw DS, Hamm PB. The taxonomic structure of Phytophthora megasperma: Evidence for emerging biological species groups. Transactions of the British Mycological Society [Internet]. 1986 ;87:557 - 573. Available from: http://www.sciencedirect.com/science/article/pii/S0007153686800973

Hansen EM, Kanaskie A, Prospero S, McWilliams M, Goheen EM, Osterbauer N, Reeser P, Sutton W. Epidemiology of Phytophthora ramorum in Oregon tanoak forests. Canadian Journal of Forest Research [Internet]. Submitted ;38:1133-1143(11). Available from: http://www.nrcresearchpress.com/doi/abs/10.1139/X07-217#.UNIUO7aKS0c

Hansen EM, Reeser P, Davidson JM, Garbelotto M, Ivors K, Douhan L, Rizzo DM. Phytophthora nemorosa, a new species causing cankers and leaf blight of forest trees in California and Oregon, U.S.A. Mycotaxon [Internet]. 2003 ;88:129–138. Available from: http://www.mycotaxon.com/vol/abstracts/88/88-129.html

Hansen EM, Hamm PB, Julis AJ, Roth LF. Isolation, incidence and management of Phytophthora in forest tree nurseries in the Pacific Northwest [USA]. Plant Disease Reporter. 1979 ;63:607-611.

Hansen EM. Alien forest pathogens: Phytophthora species are changing world forests. Boreal Env. Res. 2008 ;13:33–41.

Hansen EM, Parke JL, Sutton W. Susceptibility of Oregon forest trees and shrubs to Phytophthora ramorum: a comparison of artificial inoculation and natural infection. Plant Disease [Internet]. 2005 ;89:63-70. Available from: http://apsjournals.apsnet.org/doi/abs/10.1094/PD-89-0063

Hansen EM, Maxwell DP. Species of the Phytophthora megasperma complex. Mycologia, [Internet]. 1991 ;83:376-381. Available from: http://www.jstor.org/stable/3759999

Hansen EM, Hamm PB, Roth LF. Testing Port-Orford-cedar for resistance to Phytophthora. Plant Disease. 1989 ;73:791–794.

Hansen EM, Streito J-C, Delatour C. First confirmation of Phytophthora lateralis in Europe. Plant Disease [Internet]. 1999 ;83:587-587. Available from: http://apsjournals.apsnet.org/doi/abs/10.1094/PDIS.1999.83.6.587B

Hansen EM, Hamm PB. Survival of Phytophthora lateralis in infected roots of Port Orford cedar. Plant Disease. 1996 ;80:1075–1078.

Hansen EM, Delatour C. Phytophthora species in oak forests of north-east France. Ann. For. Sci. [Internet]. 1999 ;56:539-547. Available from: http://dx.doi.org/10.1051/forest:19990702

Hansen EM, Roth LF, Hamm PB, Julis. AJ. Survival, spread, and pathogenicity of Phytophthora spp. on Douglas-fir seedlings planted on forest sites. Phytopathology 70: [Internet]. 1980 ;70:422-425. Available from: http://www.apsnet.org/publications/phytopathology/backissues/Documents/1980Abstracts/Phyto70_422.htm