Silva, Jéssica da, et al. “Temperature Stress in Accumulation of Free Proline of Pigeonpea Seedlings from Seeds Treated With Polyamines”. Semina: Ciências Agrárias, vol. 36, no. 1, Feb. 2015, pp. 103-22, doi:10.5433/1679-0359.2015v36n1p103.