Baumgartner, J. G., Andreatta, J. A. and Júnior, A. F. (2014) “Effects of calcium and/or boron deficiency on the peduncle of sunflower inflorescence”, Pesquisa Agropecuaria Brasileira, 21(7), pp. 747–755. doi: 10.1590/S1678-3921.pab1986.v21.14883.