Franke, Lúcia Brandão, and Carlos Nabinger. “Flowering Dynamics of Five White Clover Cultivars”. Pesquisa Agropecuaria Brasileira, vol. 26, no. 9, Sept. 1991, pp. 1475-8, https://doi.org/10.1590/S1678-3921.pab1991.v26.3488.