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Gielfi, G.G., Pereira, N.M., Gomes, R. and Fornari, V.C. de B. 2013. User-Producer Interaction in the Brazilian Oil Industry: The Relationship between Petrobras and its Suppliers of Wet Christmas Tree. Journal of Technology Management & Innovation. 8, (Apr. 2013), 117–127. DOI:https://doi.org/10.4067/S0718-27242013000300066.