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200 1 $aNotes on categories and groupoids$fPhilip J. Higgins
210   $aLondon [etc.]$cVan Nostrand Reinhold$d1971
610 0 $aAlgebra
610 0 $aTeoria delle equazioni
610 0 $aCalcolo vettoriale
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700  1$aHiggins,$bPhilip J.$047754
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