Update README.md

README.md

 # Data to Examples in Filter-based Portfolio Strategies in an HMM Setting with Varying Correlation Parametrizations
 
-In this repository, you may find the data used in C. Erlwein-Sayer, S. Grimm, P. Ruckdeschel, J. Sass, T. Sayer (2019): "Data to Examples in "Filter-based Portfolio Strategies in an HMM Setting with Varying Correlation Parametrizations".
+In this repository, you may find the data used in C. Erlwein-Sayer, S. Grimm, P. Ruckdeschel, J. Sass, and T. Sayer (2019): "Data to Examples in "Filter-based Portfolio Strategies in an HMM Setting with Varying Correlation Parametrizations".
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