Klemens Böhm Karl Aberer An Object-Oriented Database Application for HyTime Document Storage. 26-33 CIKM1994/P026.pdf 1994 conf/cikm/94 CIKM db/conf/cikm/cikm94.html#BohmA94 db/conf/cikm/BohmA94.html http://doi.acm.org/10.1145/191246.191256