Bandeira, Cirineu Tolfo, et al. “Sample Size to Estimate the Mean of Morphological Traits of Rye Cultivars in Sowing Dates and Evaluation Times”. Semina: Ciências Agrárias, vol. 39, no. 2, Mar. 2018, pp. 521-32, doi:10.5433/1679-0359.2018v39n2p521.