Baumgartner, José Geraldo, José Antonio Andreatta, and Alphio Formigoni Júnior. 2014. “Effects of Calcium and Or Boron Deficiency on the Peduncle of Sunflower Inflorescence”. Pesquisa Agropecuaria Brasileira 21 (7):747-55. https://doi.org/10.1590/S1678-3921.pab1986.v21.14883.