Who conceptualized physical data independence before E.F. Codd, Chris Date and Michael Stonebreaker?

From: knorth <ken_north_at_compuserve.com>
Date: Mon, 24 Jan 2011 11:57:08 -0800 (PST)
Message-ID: <dab4bcf6-30bc-42e4-8ed0-9eda7c8a29bd_at_d1g2000pra.googlegroups.com>

Who conceptualized physical data independence before E.F. #Codd, Chris #Date and Michael #Stonebreaker?

http://bit.ly/gibPP9 Received on Mon Jan 24 2011 - 13:57:08 CST

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