Frisina, Váleria de Almeida, and João Francisco Escobedo. “Radiation and Energy Balance of Lettuce Culture Inside a Polyethylene Greenhouse”. Pesquisa Agropecuaria Brasileira, vol. 34, no. 10, Oct. 1999, pp. 1775-86, doi:10.1590/S1678-3921.pab1999.v34.5501.