-{\color{red}
-I am grateful to Priv.-Doz. Dr. habil. Volker Eyert for writing one of the certificates of this work.
-Furthermore, his lectures on computational physics and the electronic structure of materials, which I attented during my academic studies, influenced me to pursue scientific research in the field of computational physics.
-}
+I am grateful to Priv.-Doz. Dr. habil. Volker Eyert for {\color{red}writing one of the certificates of this work.
+Furthermore,} his lectures on computational physics and the electronic structure of materials, which I attented during my academic studies, influenced me to pursue scientific research in the field of computational physics.