Seung-Kyum Kim Sharma Chakravarthy Modeling Time: Adequacy of Three Distinct Time Concepts for Temporal Databases. 475-491 1993 ER db/conf/er/er93.html#KimC93 conf/er/93 er93/ER93-P474.pdf https://doi.org/10.1007/BFb0024389 journals/sigmod/BarreraFA91 ... conf/sigmod/CopelandM84 conf/sigmod/GadiaY88 journals/tods/HammerM81 journals/sigmod/JensenCGSS92 ... conf/sigmod/LumDEGPWWW84 conf/sigmod/SnodgrassA85 journals/sigmod/Soo91 books/bc/TanselCGJSS93