Claude Boksenbaum Michèle Cart Jean Ferrié Jean-François Pons Concurrent Certifications by Intervals of Timestamps in Distributed Database Systems. 409-419 1987 13 IEEE Trans. Software Eng. 4 db/journals/tse/tse13.html#BoksenbaumCFP87 http://doi.ieeecomputersociety.org/10.1109/TSE.1987.233178