Tsien, Hsien-HoHsien-HoTsien2009-01-222018-06-282009-01-222018-06-281978http://ntur.lib.ntu.edu.tw//handle/246246/108855en-USPaleobiogeography and Evolution of Middle Devonian to Frasnian Hexagonaria (Rugose Corals) in Western Europeconference paper