Hai-Yann Hwang Umeshwar Dayal Using the Entity-Relationship Model for Implementing Multi-Model Database Systems. 235-256 1981 ER db/conf/er/er81.html#HwangD81 conf/er/81 db/conf/er/HwangD81.html er81/ER81-P235.pdf journals/is/TsichritzisK78 conf/er/CardenasP79 journals/tods/Chen76 ... conf/er/ChuT79 ... journals/is/DayalB82 ... ... conf/er/Iossiohidis79 ... conf/sigmod/LuskOP80 conf/er/MelkanoffZ79 ... conf/er/Sakai79 ... conf/er/Tsao79 conf/er/WongK79 conf/sigmod/Zaniolo79 conf/ds/Zaniolo79