M. Barbieri, C. B. Dutra, N. H. Bianchini, M. F. B. Muniz, and A. C. Dörr, “ECONOMIC ANALYSIS OF CITRUS ROSARIO DO SUL/RS: A FOCUS ON THE ADOPTION OF ENVIRONMENTAL CERTIFICATION PROGRAMS”, REGET, vol. 11, no. 11, pp. 2407–2412, Jun. 2013.