{"id":"000537930","type":"article","title":"On subtractive operations, subtractive numbers, and purportedly negative numbers in Old Babylonian mathematics","pages":"42-60","container-title":"Zeitschrift für Assyriologie und vorderasiatische Archäologie, 83.1993","author":[{"family":"Høyrup","given":"J."}],"issued":{"raw":"1993"}}