Few corrections to spelling in the introductions

Signed-off-by: Riccardo Finotello <riccardo.finotello@gmail.com>

thesis.bib

@@ -549,23 +549,6 @@
   number = {1-3}
 }
 
-@article{Blumenhagen:2007:FourdimensionalStringCompactifications,
-  title = {Four-Dimensional String Compactifications with {{D}}-Branes, Orientifolds and Fluxes},
-  author = {Blumenhagen, Ralph and Körs, Boris and Lüst, Dieter and Stieberger, Stephan},
-  date = {2007},
-  journaltitle = {Physics Reports},
-  volume = {445},
-  pages = {1--193},
-  issn = {03701573},
-  doi = {10/dthp8q},
-  abstract = {This review article provides a pedagogical introduction into various classes of chiral string compactifications to four dimensions with D-branes and fluxes. The main concern is to provide all necessary technical tools to explicitly construct four-dimensional orientifold vacua, with the final aim to come as close as possible to the supersymmetric Standard Model. Furthermore, we outline the available methods to derive the resulting four-dimensional effective action. Finally, we summarize recent attempts to address the string vacuum problem via the statistical approach to D-brane models.},
-  archivePrefix = {arXiv},
-  eprint = {hep-th/0610327},
-  eprinttype = {arxiv},
-  file = {/home/riccardo/.local/share/zotero/files/blumenhagen_et_al_2007_four-dimensional_string_compactifications_with_d-branes,_orientifolds_and_fluxes.pdf},
-  number = {1-6}
-}
-
 @book{Blumenhagen:2009:IntroductionConformalField,
   title = {Introduction to {{Conformal Field Theory}}},
   author = {Blumenhagen, Ralph and Plauschinn, Erik},