da SILVA, Eduardo Teixeira, and Fabiano SCHWONKA. “ECONOMIC VIABILITY FOR LETTUCE PRODUCTION ON HIDROPONIC SYSTEM AT COLOMBO, METROPOLITAN REGION OF CURITIBA, PR”. Scientia Agraria, vol. 2, no. 1, Dec. 2001, pp. 111-6, doi:10.5380/rsa.v2i1.1007.