Julia Savva, Ahmed Koubaa, Francine Tremblay, Yves Bergeron. Effects of radial growth, tree age, climate, and seed origin on wood density of diverse jack pine populations. 2009. Trees  DOI : 10.1007/s00468-009-0378-0 

Julia Savva, Yves Bergeron, Bernhard Denneler, Ahmed Koubaa, Francine Tremblay. Effect of interannual climate variations on radial growth of jack pine provenances in Petawawa, Ontario. 2008. Can. J. For. Res. 38(3): 619-630. DOI : 10.1139/X07-178 10.1139/X07-178  

Julia Savva, Bernhard Denneler, Ahmed Koubaa, Francine Tremblay, Yves Bergeron, M.-G. Tjoelker. Seed transfer and climate change effects on radial growth of jack pine populations in a common garden in Petawawa, Ontario, Canada. 2007. For. Ecol. Manage. 242(2-3):636-647. DOI : 10.1016/j.foreco.2007.01.073