Archives for http://delivery.acm.org/10.1145/120000/114686/a1990-corbato.pdf?ip=209.171.206.98&id=114686&acc=OPEN&key=4D4702B0C3E38B35%2E4D4702B0C3E38B35%2E4D4702B0C3E38B35%2E6D218144511F3437&__acm__=1571684131_a431b2214b848a9dfafa17c2719d8cc8
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