Peter P. Chen An Algebra for a Directional Binary Entity-Relationship Model. 37-40 ICDE84/P037.pdf 1984 ICDE db/conf/icde/icde84.html#Chen84 conf/icde/84 db/conf/icde/Chen84.html conf/er/AtzeniC83 conf/er/AtzeniC81 conf/er/BatiniS79 conf/vldb/BenneworthBTHM81 ... ... conf/er/79 conf/er/81 ... conf/er/Chen81 ... conf/er/83 conf/sigmod/DeheneffeH76 conf/sigmod/DogacO80 conf/er/ElmasriW81 journals/tse/JajodiaNS83 ... ... conf/er/LuskO79 conf/er/MarkowitzR83 conf/er/MarkowitzR83a conf/icde/ParentS84 ... ... books/cs/Ullman82 conf/er/UrsprungZ83 ... conf/sigmod/Zaniolo83 conf/er/ZhangM83