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diff --git a/ref.bib b/ref.bib
index a11c235..79de64a 100644
--- a/ref.bib
+++ b/ref.bib
@@ -810,6 +810,20 @@
   keywords =     "Marx, Karl, 1818-1883",
 }
 
+@Article{Pertsas2016,
+  author =       "Vayianos Pertsas and Panos Constantopoulos",
+  date =         "2016-05",
+  journaltitle = "International Journal on Digital Libraries",
+  title =        "Scholarly Ontology: modelling scholarly practices",
+  doi =          "10.1007/s00799-016-0169-3",
+  ISSN =         "1432-1300",
+  number =       "3",
+  pages =        "173--190",
+  volume =       "18",
+  file =         ":Pertsas2016 - Scholarly Ontology_ Modelling Scholarly Practices.pdf:PDF",
+  publisher =    "Springer Science and Business Media LLC",
+}
+
 @InCollection{Pontis2015,
   author =       "Sheila Pontis",
   date =         "2015-06",