conf/vldb/81 David B. Lomet Digital B-Trees VLDB81/P333.PDF 333-344 1981 VLDB db/conf/vldb/vldb81.html#Lomet81 db/conf/vldb/Lomet81.html journals/tods/AstrahanBCEGGKLMMPTWW76 journals/acta/BayerM72 journals/tods/BayerU77 journals/csur/Comer79 journals/tods/FaginNPS79 ... journals/bit/Larson78 conf/vldb/Litwin78 conf/sigmod/Lomet79 ... journals/acta/Yao78