Mantovani, J.R. et al. 2014. Phosphorus levels in soil and lettuce production due to phosphorus fertilization. Semina: Ciências Agrárias. 35, 4Supl (Sep. 2014), 2369–2380. DOI:https://doi.org/10.5433/1679-0359.2014v35n4Suplp2369.