conf/vldb/85 Patrick C. Fischer Dirk Van Gucht Determining when a Structure is a Nested Relation. 171-180 1985 VLDB db/conf/vldb/vldb85.html#FischerG85 db/conf/vldb/FischerG85.html VLDB85/P171.PDF conf/pods/AbiteboulB84 journals/cacm/Codd70 conf/pods/FischerG84 conf/stacs/FischerG85 ... conf/pods/JaeschkeS82 ... conf/vldb/Makinouchi77 ... journals/acr/ThomasF86 ... books/cs/Ullman82