Paleolimnological assessment of nutrient enrichment on diatom assemblages in a priori defined nitrogen- and phosphorus-limited lakes downwind of the Athabasca Oil Sands, Canada oleh Kathleen R. Laird, Biplob Das, Brittany Hesjedal, Peter R. Leavitt, Graham R. Mushet, Kenneth A. Scott, Gavin L. Simpson, Bjorn Wissel, Jared Wolfe, Brian F. Cumming