Leonid Libkin A Relational Algebra for Complex Objects Based on Partial Information. 29-43 MFDBS1991/P029.pdf 1991 MFDBS db/conf/mfdbs/mfdbs91.html#Libkin91 conf/mfdbs/91 db/conf/mfdbs/Libkin91.html conf/pods/BancilhonK86 conf/dood/Beeri89 ... conf/adbt/Biskup79 journals/tcs/BunemanJO91 conf/sigmod/Colby89 journals/tcs/Girard86 books/el/leeuwen90/GunterS90 conf/sigmod/GyssensPG89 journals/jacm/ImielinskiL84 ... ... conf/nf2/87 ... conf/icdt/Ohori88 books/sp/ParedaensBGG89 journals/tods/RothKS88 journals/acta/RothKS89 ... journals/is/SchekS86 conf/icalp/Scott82 journals/jcss/Smyth78 conf/dood/TanakaC89 books/cs/Ullman82 journals/jcss/Zaniolo84