conf/sigmod/81 Donald E. Swartwout J. C. Lagarias On the Requirements of Navigational Relationship Representations. 1-9 1981 SIGMOD Conference db/conf/sigmod/sigmod81.html#SwartwoutL81 SIGMOD81/P001.PDF http://doi.acm.org/10.1145/582318.582320 db/conf/sigmod/SwartwoutL81.html ... ... ... ... conf/vldb/EggersS80 journals/jacm/Elias74 journals/cacm/Hahn74 journals/ipl/LagariasS82 journals/is/Severance75 ... journals/cacm/TarjanY79 ... ... journals/tods/Yao77