Kiyoung Moon Namje Park Kyoil Chung Sungwon Sohn Jaecheol Ryou Trusted Certificate Validation Scheme for Open LBS Application Based on XML Web Services. 86-95 2005 1 JIPS 1 http://www.jips-k.org/dlibrary/JIPS_v01_no1_paper15.pdf db/journals/jips/jips1.html#MoonPCSR05