Nelson, P. R., and T. B. Wheeler. “Persistence of Epiphytic Lichens Along a Tephra-Depth Gradient Produced by the 2011 Puyehue-Cordón Caulle Eruption in Parque Nacional Puyehue, Chile”. BOSQUE, vol. 37, no. 1, May 2017, pp. 97-105, doi:10.4067/S0717-92002016000100010.