Não informado. (1992). Test. Spanish Society of Statistics and Operations Research.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Test. Madrid: Spanish Society of Statistics and Operations Research, 1992.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Test. Spanish Society of Statistics and Operations Research, 1992.
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