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Almeida J, Higgins PM. Monoids respecting $n$-chains of intervals. J. Algebra. 1997;187:183-202.Edit

de Oliveira PM, Valente PA. Monte Carlo Simulation of a Drifting Buoy on the Sea Surface Using a 6-Dimensional Model. In: Computational Physics, Chemistry and Biology.; 1997. 4. p. 41-46p. Edit

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