db/journals/dpd/KangsabanikMM00.html Prithwish Kangsabanik Rajib Mall Arun K. Majumdar Semantic Based Concurrency Control of Open Nested Transactions in Active Object Oriented Database Management Systems. 181-222 2000 8 Distributed and Parallel Databases 2 db/journals/dpd/dpd8.html#KangsabanikMM00 http://kapis.www.wkap.nl/oasis.htm/257405 DPD/8/P181.pdf