Morais, H. et al. 2003. Physiological characteristics and growth of coffee plants grown under shade of pigeonpea and unshaded. Pesquisa Agropecuaria Brasileira. 38, 10 (Oct. 2003), 1131–1137. DOI:https://doi.org/10.1590/S1678-3921.pab2003.v38.6682.