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.