Anthony Kosky Observational Distinguishability of Databases with Object Identity. 11 1995 DBPL db/conf/dbpl/dbpl95.html#Kosky95 conf/dbpl/95 db/conf/dbpl/Kosky95.html DBPL1995/X20.pdf conf/sigmod/AbiteboulK89 journals/vldb/AbiteboulB95 journals/tods/AbiteboulH87 conf/pods/Bancilhon88 conf/dbpl/TannenBN91 conf/icalp/TannenS91 conf/icdt/TannenBW92 journals/siamcomp/Hull86 conf/vldb/HullY90 journals/csur/HullK87 conf/oopsla/KhoshafianC86 ...