conf/pods/88 Peter Buneman Susan B. Davidson Aaron Watters A Semantics for Complex Objects and Approximate Queries. 305-314 1988 PODS db/conf/pods/pods88.html#BunemanDW88 http://doi.acm.org/10.1145/308386.308463 journals/anthology/cd1-3:PODS88/P305.PDF journals/anthology/dvd1:text/1-3/PODS88/P305.PDF conf/pods/BancilhonK86 conf/pods/AbiteboulH84 journals/tods/RothKS88 journals/tods/OzsoyogluY87 ... conf/lics/RoundsK86 conf/icalp/Scott82 journals/tcs/BunemanJO91 journals/jcss/Smyth78 journals/jacm/ImielinskiL84 ... ... journals/tcs/Winskel85 journals/tcs/Ait-Kaci86