fix URL and names

README.md

@@ -1,3 +1,3 @@
 This package includes R functions to the most frequently used three-dimensional fixed effects panel data models and the appropriate Within estimators based on
 
- * Balázsi, László, Mátyás, László and Wansbeek, Tom, (2014), [http://EconPapers.repec.org/RePEc:ceu:econwp:2014_1](The Estimation of Multi-dimensional Fixed Effects Panel Data Models), No 2014_1, CEU Working Papers, Department of Economics, Central European University.
+ * László Balázsi, László Mátyás and Tom Wansbeek (2014): [The Estimation of Multi-dimensional Fixed Effects Panel Data Models](http://EconPapers.repec.org/RePEc:ceu:econwp:2014_1). No 2014_1, CEU Working Papers, Department of Economics, Central European University.