Alfred Fent Carl-Alexander Wichert Burkhard Freitag Logical Update Queries as Open Nested Transactions. 45-66 http://dx.doi.org/10.1007/3-540-46466-2_3 1999 conf/fmldo/1999lncs FMLDO - Selected Papers db/conf/fmldo/fmldoLNCS99.html#FentWF99a