Guedes, Roberta Sales, et al. “Emergence and Vigor of Amburana Cearensis (Allemão) A.C. Smith Seedling in Function of the Sowing Position and Depth”. Semina: Ciências Agrárias, vol. 31, no. 4, Dec. 2010, pp. 843-50, doi:10.5433/1679-0359.2010v31n4p843.