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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def reference_journal(self, index):
 """Return the reference journal name."""

        # TODO Change the column name 'Journal' to an other?
        ref_type = self.reference_type(index)
        if ref_type == "journalArticle":
            return self.reference_data(index)["publicationTitle"]
        else:
            return "({})".format(ref_type)