Silva, Gerson Henrique Da; Esperancini, Maura Seiko Tsutsui - 2008
junho a novembro de cada ano. -----------------------------------------------With the increase petroleum price and … the seasonal variation index of the price of castor bean, for it is essential for the prediction of its price in a … determined period of the year. The price received by the producers from Paraná State was utilized and the methodology of the …