Economic profile of two species of Genus der Euterpe, producers of açaí fruits, from the Pará and Amazonas States - Brazil - E, Matos, Cláudia Blair; Sampaio, Paulo de Tarso Barbosa; A.A, Rivas, Alexandre; C.S, Matos, Joao; G., Hodges, Donald (International Journal of Environment, Agriculture and Biotechnology, 2017)