Update recordpubli to improve method find_affiliation.

modules/invenio_tools/recordpubli.py

@@ -385,7 +385,7 @@ class RecordPubli(Record):
             pattern (str):
                 regular expression defining the affiliation keys.
                 It has to be build for an exact match namely containing
-                start and end of string. This is reuqired to separate
+                start and end of string. This is required to separate
                 `Ecole Plolytechnique` from `Ecole Polytechnique, Lausanne`.
 
         Returns:
@@ -400,7 +400,8 @@ class RecordPubli(Record):
         pattern = "(%s)" % pattern
 
         data = (df.affiliation.str.extract(pattern, expand=False)
-                .dropna())
+                .dropna()
+                .unique())
 
         return (data[0] if len(data) > 0 else "")