LAXTON, D. L., S. A. WATMOUGH, J. AHERNE, and J. STRAKER. “An Assessment of Nitrogen Saturation in Pinus Banksiana Plots in the Athabasca Oil Sands Region, Alberta”. Journal of Limnology, vol. 69, no. s1, Aug. 2010, pp. 171-80, doi:10.4081/jlimnol.2010.s1.171.