... given.T6m tll.t. Trong bai bao nay, chung t6i nghienCUllm9t16-pcon cila cac hroc doCO'sO-dir lieu, d6111,16-pcachro'cdo CSDLw- phi chu irinh,Chung t6i da chtrng minh diro'c ... CSDLw- phi chu irinh,Chung t6i da chtrng minh diro'c ding voilap nay thl khai niern phi chu trinh.cua cac sieu do thj diro'c djnh nghia trong1:9'thuyetdo thi va trong1:9'thuyet ... trong1:9'thuyet CSDL111,tucng diro'ng. Phattrie'ncac ket qua cda1:9'thuydt do thj, chung t6i da du'a ra nhirng d~c trtrng m&icho16-pcac hro'cdo nay.1. INTRODUCTIONSince...