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Pesquisa Operacional periodically makes adjustments and reformulations aiming to maintain its quality and to improve its dissemination and visibility within the scientific community of operations research. With the help of Prof. Horacio, we are taking this opportunity to make some changes in the journal.doi:10.1590/s0101-74382011000100001 fatcat:t5b5cvgk2jaczh5v4bvssjfpry