Gonçalves, D. F., A. A. Francischini, A. F. Alves, and J. L. Parré. “CO-INTEGRATION, CAUSALITY AND EFFECTIVENESS OF HEDGE FOR FAT OX’S PRICES OF THE CONTRACT FOR PARANÁ STATE’S NORTHWEST”. Informe GEPEC, vol. 12, no. 1, Jan. 2000, doi:10.48075/igepec.v12i1.1805.