MOREIRA, J. C. S.; MEDEIROS, M. C.; SCHLEHUBER, A. M. Correlation coefficients in grain yields in wheat variety tests between locations in Rio Grande do Sul, Brazil for the 3 years, 1966-1968. Pesquisa Agropecuaria Brasileira, v. 6, n. 1, p. 53–56, 15 Apr.2014.