Yonglak Sohn Sukhoon Kang Songchun Moon Concurrency control scheme in multi-level secure database management systems. 733-736 1994 40 Microprocessing and Microprogramming 10-12 http://dx.doi.org/10.1016/0165-6074(94)90029-9 db/journals/jsa/jsa40.html#SohnKM94