conf/sigmod/87 Isabel F. Cruz Alberto O. Mendelzon Peter T. Wood A Graphical Query Language Supporting Recursion. 323-330 1987 SIGMOD Conference db/conf/sigmod/sigmod87.html#CruzMW87 SIGMOD87/P323.PDF http://doi.acm.org/10.1145/38713.38749 db/conf/sigmod/CruzMW87.html books/aw/AhoHU74 journals/tods/AhoSU79 conf/popl/AhoU79 conf/pods/BancilhonMSU86 conf/pods/ChandraH82 conf/stoc/ChandraM77 journals/tods/Clemons81 ... ... journals/tcs/FortuneHW80 conf/vldb/HeilerR85 journals/jacm/HenschenN84 conf/stoc/LapaughR78 ... conf/sigmod/RosenthalHDM86 conf/pods/SaccaZ86 journals/tods/Ullman85 conf/stoc/Vardi82 ...