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Smith, Richard Simon; Kuhlemeier, Cris; Prusinkiewicz, Przemyslaw (2006). Inhibition fields for phyllotactic pattern formation: a simulation study. Canadian Journal of Botany, 84(11), pp. 1635-1649. Toronto: National Research Council Canada 10.1139/B06-133
von Arb, Christoph; Brunold, Christian (1990). Lichen physiology and air pollution. I. Physiological responses of in situ Parmelia sulcata among air pollution zones within Biel, Switzerland. Canadian Journal of Botany, 68(1), pp. 35-42. National Research Council Canada 10.1139/b90-006
