Yongjun Jing Jie Jian Shaochun Zhong Xin Li Research on Update Service in Learning Resources Management System. 262-269 2008 Edutainment http://dx.doi.org/10.1007/978-3-540-69736-7_28 conf/edutainment/2008 db/conf/edutainment/edutainment2008.html#JingJZL08