conf/sigmod/91 Sitaram Lanka Eric Mays Fully Persistent B+-trees. 426-435 1991 SIGMOD Conference db/conf/sigmod/sigmod91.html#LankaM91 http://doi.acm.org/10.1145/115790.115861 db/conf/sigmod/LankaM91.html SIGMOD91/P426.PDF conf/vldb/ChouK86 journals/csur/Comer79 journals/jcss/DriscollSST89 journals/cacm/HeldS78 journals/tse/KatzL84 journals/tkde/MaysLDW91 books/cs/Ullman88