Böttcher, Stefan, and Rita Steinmetz. “Testing Containment of XPath Expressions in Order to Reduce the Data Transfer to Mobile Clients.”10.1007/978-3-540-39403-7_30__Advances in Databases and Information Systems, 7th East European Conference, ADBIS 2003, Springer, 2003, pp. 400–10, doi:10.1007/978-3-540-39403-7_30.