Yang Hee Kim Myeong Sun Kim Seog-Hyong Kwon Shang-Sung Jeong The Object-Oriented Design of KROSS: An Object-Based Spatial Database System. 603-612 1996 conf/dexa/1996 DEXA db/conf/dexa/dexa96.html#KimKKJ96 http://dx.doi.org/10.1007/BFb0034714