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Bulletin of the Brazilian Mathematical Society, New Series > 2002 > 33 > 1 > 99-123
Reproducao & Climaterio > 2013 > 28 > 3 > 112-116
Bulletin of the Brazilian Mathematical Society, New Series > 2002 > 33 > 1 > 99-123
Reproducao & Climaterio > 2013 > 28 > 3 > 112-116