Endobiotic Rugosan Symbionts in Stromatoporoids from the Sheinwoodian (Silurian) of Baltica Vinn, Olev ; Mõtus, Mari-Ann Abstract Publication: PLoS ONE Pub Date: February 2014 DOI: 10.1371/journal.pone.0090197 Bibcode: 2014PLoSO...990197V