Zhi Zhang Pengfei Shi Haoyang Che Jun Gu An Algebraic Framework for Schema Matching. 421-446 2008 19 Informatica, Lith. Acad. Sci. 3 http://iospress.metapress.com/content/h5633053r12nt634/ db/journals/informaticaLT/informaticaLT19.html#ZhangSCG08