Leaf shape analysis using the multiscale minkowski fractal dimension, a new morphometric method: a study with passiflora(passifloraceae) - Plotze, Rodrigo de Oliveira; Falvo, Maurício; Pádua, Juliano Gomes; Bernacci, Luis Carlos; Vieira, Maria Lúcia Carneiro; Oliveira, Giancarlo Conde Xavier; Bruno, Odemir Martinez (Canadian Journal of Botany, 2005)