de Souza, A. P., Leonel, S. and da Silva, A. C. (2012) “Basal temperature and thermal sum in phenological phases of nectarine and peach cultivars”, Pesquisa Agropecuaria Brasileira, 46(12), pp. 1588–1596. doi: 10.1590/S1678-3921.pab2011.v46.11279.