- Christiansen, E. 1967. Stripet vedborer. Vinterhogd tommer angripes sterkest [Striped ambrosia beetle; winter cut lumber is strongest attacked]. Skogeieren 11:21, 45.
- Christiansen, E. 1970. Insect pests in forests of the Nordic countries 1961-1966 . Norsk Entomologisk Tidsskrift 17:153-158.
- Christiansen, E. 1980. Motstandskraft mot barkbilleangrep . Norsk Skogbruk 26:31.
- Christiansen, E. 1981. Granbarkbillens erobringsevne, sett i forhold til vertstreets viralitet og vekst [Infestation ability of epidemic Ips typographus in relation to vitality and increment of Norway spruce]. Norsk Institutt for Skogforskning, Rapport No. 2/31. 20 p.
- Christiansen, E., and R. Horntvedt. 1983. Combined Ips/Ceratocystis attack on Norway spruce, and defence mechanisms of the trees . Zeitschrift fur Angewandte Entomologie 96:110-118.
- Christiansen, E., and K. J. Huse. 1980. Infestation ability of Ips typographus in Norway spruce, in relation to butt rot, tree vitality, and increment . Meddelelser fra det Norsk Institutt for Skogforskning 35:467-482.
- Christiansen, E., and T. Saether. 1968. Infestation density of Trypodendron lineatum (Olivier) (Coleoptera: Scolytidae) in relation to felling date of logs . Norsk Entomologisk Tidsskrift 15:28-30.
- Horntvedt, R., and E. Christiansen. 1979. Gammelskog og grantorke . Norsk Skogbruk 25:21-23.
- Christiansen, E. 1984. Bartraernes forsvar mot barkbilleangrep [In Norwegian] . Naturen 1984:43-48.
- Christiansen, E. 1985a. Ceratocystis polonica inoculated in Norway spruce: blue-staining in relation to inoculum density, sesinosis and tree growth . European Journal of Forest Pathology 15:160-167.
- Christiansen, E. 1985b. Ips/Ceratocystis-infection of Norway spruce: what is a deadly dosage? . Journal of Applied Entomology 99:6-11.
- Christiansen, E. 1988. Influence of Norway spruce trees against the Eurasian spruce bark beetle, Ips typographus, and its symbiotic fungi . International Congress of Entomology, Proceedings 18:439.
- Christiansen, E. 1989. Bark beetles and air pollution . Meddelelser fra det Norsk Institutt for Skogforskning 42:101-107.
- Christiansen, E., and A. Bakke. 1988a. The spruce bark beetle of Eurasia. Pages 479-503 in A. A. Berryman, Dynamics of forest insect populations: patterns, causes, implications. Plenum Press, New York. xx + 603 p.
- Christiansen, E., and A. Bakke. 1988b. Granbarkbillen, Hva nyere forskning har laert oss [The spruce bark beetle Ips typographus: a review of our present knowledge] [In Norwegian, English summary]. Norsk Institutt for Skogforskning, Rapport 4. 21 p.
- Christiansen, E., and A. Ericsson. 1986. Starch reserves in Picea abies in relation to defense reaction against a bark beetle transmitted blue-stain fungus, Ceratocystis polonica . Canadian Journal of Forest Research 16:78-83.
- Christiansen, E., R. H. Waring, and A. A. Berryman. 1987. Resistance of conifers to bark beetle attack: searching for general relationships . Forest Ecology and Management 22:98-106.
- Filip, G. M., E. Christiansen, and C. A. Parks. 1989. Secondary resin production increases with vigor of Abies grandis inoculated with Trichosporium symbioticum in northeastern Oregon. United States Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station, Portland, Oregon, Research Note PNW-489. 10 p.
- Furniss, M. M., H. Solheim, and E. Christiansen. 1988. Mechanism of transmission of the pathogenic blue-stain fungus, Ophiostoma polonicum, by Ips typographus in Norway spruce . International Congress of Entomology, Proceedings 18:430.
- Mulock, P., and E. Christiansen. 1986. The threshold of successful attack by Ips typographus on Picea abies: a field experiment . Forest Ecology and Management 14:125-132.
- Christiansen, E. 1991. Ips typographus and Ophiostoma polonicum versus Norway spruce: joint attack and host defense. Pages 321-334 In Y.N. Baranchikov, W.J. Mattson, F.P. Hain and T.L. Payne (eds.), Forest insect guilds: Patterns of interactions with host trees. United States Department of Agriculture, Forest Service, Northeastern Forest Research Station (Radnor, PA), General Technical Report NE-153.
- Christiansen, E. 1992. After-effects of drought did not predispose young Picea abies to infection by the bark beetle-transmitted blue-stain fungus Ophiostoma polonicum . Scandinavian Journal of Forest Research 7:557-569.
- Christiansen, E., and G. Fjone. 1993. Pruning enhances the susceptibility of Pices abies to infection by the beetle-transmitted Blue-stain fungus, Ophiostoma polonicum . Scandinavian Journal of Forest Research 8:235-245.
- Christiansen, E., and H. Solheim. 1990. The bark beetle-associated blue-stain fungus Ophiostoma polonicum can kill various spruces and Douglas fir . European Journal of Forest Pathology 20:436-446.
- Furniss, M., H. Solheim, and E. Christiansen. 1990. Transmission of blue-stain fungi by Ips typographus (Coleoptera: Scolytidae) in Norway spruce . Annals of the Entomological Society of America 83:712-716.
- Horntvedt, R., E. Christiansen, H. Solheim, and S. Wang. 1983. Artificial inoculation with Ips typographus-associated blue-stain fungi can kill healthy Norway spruce trees. Meddelelser fra Norsk Institutt for Skogforskning 38(4). 20 pp. (Listed in Wood & Bright 1987 under 1st author only).
- Berryman, A., and E. Christiansen. 1995. Can we predict the resistance of Norway spruce to bark beetle-fungus infection? Page 33 In E. Christiansen (ed.), Bark beetles, blue stain fungi, and conifer defence systems. Proceedings, IUFRO Symposium, As, Norway.
- Brignolas, F., B. Lacroix, F. Lieutier, D. Sauvard, A. Drouet, A. Claudot, A. Yart, A. Berryman, and E. Christiansen. 1995. Induced responses in phenolic metabolism in two Norway spruce clones after wounding and inoculations with Ophiostoma polonicum, a bark beetle-associated fungus . Plant Physiology 109:821-827.
- Brignolas, F., F. Lieutier, D. Sauvard, E. Christiansen, and A. Berryman. 1998. Phenolic predictors for Norway spruce resistance to the bark beetle Ips typographus (Coleoptera: Scolytidae) and an associated fungus, Ceratocystis polonica . Canadian Journal of Forest Research 28:720-728.
- Christiansen, E., and A. Bakke. 1997. Does drought really enhance Ips typographus epidemics? — A Scandinavian perspective. Pages 163-171 In J.-C. Grégoire et al. (eds.), Proceedings: Integrating cultural tactics into the management of bark beetles and reforestation pests. United States Department of Agriculture, Forest Service, Northeastern Forest Experiment Station (Radnor, PA), General Technical Report NE-236.
- Christiansen, E., and P. Krokene. 1999. Can Norway spruce trees be "vaccinated" against attack by Ips typographus?. Agricultural and Forest Entomology 1:185-187.
- Christiansen, E., and B. Kucera. 1999. Resin pockets in Norway spruce wood are not caused by the bark beetle Ips typographus. Rapport fra Skogforskningen, Supplement 12. 9 pp.
- Christiansen, E., V. Franceshi, N. Nagy, T. Krekling, A. Berryman, P. Krokene, and H. Solheim. 1999. Traumatic resin duct formation in Norway spruce (Picea abies (L.) Karst.) after wounding or infection with a bark beetle-associated blue-stain fungus, Ceratocystis polonica Siem. Pages 79-89 In Physiology and genetics of tree-phytophage interactions: International Symposium. Proceedings of International Symposium on Physiology and Genetics of Tree-Phytophage Interactions, Gulan, France, August 31 -September 4, 1997. Colloques de l'INRA 90.
- Lieutier, F., F. Brignolas, D. Sauvard, C. Galet, A. Yart, M. Brunet, E. Christiansen, H. Solheim, and A. Berryman. 1997. Phenolic compounds as predictors of Norway spruce resistance to bark beetles. Pages 215-216 In J.-C. Grégoire et al. (eds.), Proceedings: Integrating cultural tactics into the management of bark beetles and reforestation pests. United States Department of Agriculture, Forest Service, Northeastern Forest Experiment Station (Radnor, PA), General Technical Report NE-236.