Research on quorum systems (such as the finite projective planes described in the article) dates back to the 80s.
The 70s, if you want to be pedantic (e.g. Gifford's "Weighted Voting for Replicated Data" or Thomas's "A Majority Consensus Approach to Concurrency Control for Multiple Copy Databases", both from '79).
The 70s, if you want to be pedantic (e.g. Gifford's "Weighted Voting for Replicated Data" or Thomas's "A Majority Consensus Approach to Concurrency Control for Multiple Copy Databases", both from '79).