Camarero, J. J., S. Sisó, and E. Gil-Pelegrín. “Fractal Dimension Does Not Adequately Describe the Complexity of Leaf Margin in Seedlings of Quercus Species”. Anales Del Jardín Botánico De Madrid, vol. 60, no. 1, June 2002, pp. 63-71, doi:10.3989/ajbm.2002.v60.i1.82.