gerhard weikum gottfried vossen transactional information systems theory algorithms and the practice of concurrency control and recovery sciencedirect google books spends two pages on the topic i don't seem to have access to the full text but this would probably give a good indication of the depth to which this article should discuss the topic professional nosql has a short blurb that could further help to establish notability i had considered nominating the article again but i'd probably still vote weak keep and rewrite again ''''