M. Toebe, A. Cargnelutti Filho, L. H. Loose, A. B. Heldwein, and A. J. Zanon, “Leaf area of snap bean (Phaseolus vulgaris L.) according to leaf dimensions”, Sem. Ci. Agr., vol. 33, no. 6Supl1, pp. 2491–2500, Dec. 2012.