Auler, A. C., Galetto, S. L., Silva, A. R. e Verona, R. B. (2015) “Lettuce seedlings development index in different substrates using multivariate analysis”, Científica. Dracena, SP, 43(1), p. 50–57. doi: 10.15361/1984-5529.2015v43n1p50-57.