Jim Gray 0001 Daniel P. Siewiorek 39-48 1991 24 Computer 9 db/journals/computer/computer24.html#GrayS91 https://doi.org/10.1109/2.84898 http://doi.ieeecomputersociety.org/10.1109/2.84898 https://www.wikidata.org/entity/Q56882961