Show 10 5 10 15 20 50 100 250 Sort by year (new to old) Actions Download search results Subscribe to news feed Your filters: cql: author="GRAHN, Y" or (type exact bookEditor and editor="GRAHN, Y") Add to list Journal Article A2 Correlation of Ordovician regional chitinozoan biozonations. F PARIS, Jacques Verniers (UGent) , A ACHAB, A ALBANI, A ANCILLETTA, E ASSELIN, R BROCKE, XIAOHONG CHEN, O FATKA, Y GRAHN, et al. (1999) Acta Universitatis Carolinae - Geologica. 43 (1/2. p.291-294