Remove one book

exercises/literature/exercise-solution.tex

@@ -1,4 +0,0 @@
-The first-mentioned book \cite{lamport1994} has been written by the creator of \LaTeX{}, Leslie Lamport himself. A more recent publication is \enquote{\LaTeX\ in 24 Hours} \cite{datta2017}. There is a plethora of further handbooks \cite*[e.\,g.,][]{goossensmittelbach2002}.
-
-\bibliographystyle{plain}
-\bibliography{exercises/literature/literature.done.bib}

exercises/literature/literature.code.done.tex

@@ -0,0 +1,5 @@
+An introductory \LaTeX{} course can be found in \enquote{\LaTeX{} in 24 Hours} \cite{datta2017}.
+There is a plethora of further handbooks \cite*[e.\,g.,][]{goossensmittelbach2002}.
+
+\bibliographystyle{plain}
+\bibliography{exercises/literature/literature.done.bib}

exercises/literature/literature.done.bib

@@ -1,15 +1,3 @@
-@book{lamport1994,
-  author    = {Leslie Lamport},
-  title     = {LaTeX - {A} Document Preparation System: User's 
-               Guide and Reference Manual, Second Edition},
-  publisher = {Pearson / Prentice Hall},
-  year      = {1994},
-  isbn      = {978-0-201-52983-8},
-  timestamp = {Fri, 08 Apr 2011 18:21:00 +0200},
-  biburl    = {https://dblp.org/rec/books/daglib/0023602.bib},
-  bibsource = {dblp computer science bibliography,
-               https://dblp.org}
-}
 @book{datta2017,
   author    = {Dilip Datta},
   title     = {LaTeX in 24 Hours - {A} Practical Guide for 

exercises/literature/literature.done.tex

@@ -1,3 +1,3 @@
 \codeblock{bibtex}{./exercises/literature/literature.done.bib}
 
-\codeblock{latex}{./exercises/literature/exercise-solution.tex}
+\codeblock{latex}{./exercises/literature/literature.code.done.tex}

exercises/literature/literature.raw.tex

@@ -1,5 +1,4 @@
-The first-mentioned book (Lamport, 1994) has been written by the creator of \LaTeX{}, Leslie Lamport himself.
-A more recent publication is \enquote{\LaTeX\ in 24 Hours} (Datta, 2017).
+An introductory \LaTeX{} course can be found in \enquote{\LaTeX{} in 24 Hours} (Datta, 2017).
 There is a plethora of further handbooks (e.\,g., Goossens, Mittelbach and Samarin, 2002).
 
 ~\\
@@ -9,5 +8,3 @@ There is a plethora of further handbooks (e.\,g., Goossens, Mittelbach and Samar
 \noindent [Datta 2017] Datta, Dilip: LaTeX in 24 Hours - A Practical Guide for Scientific Writing. Springer, 2017. \url{http://dx.doi.org/10.1007/978-3-319-47831-9}. – ISBN 978–3–319–47830–2
 
 \noindent [Goossens u. a. 2002] Goossens, Michel ; Mittelbach, Frank ; Samarin, Alexander: Der LaTeX Begleiter. Addison-Wesley, 2002. – ISBN 978–3–8273–7044–0
-
-\noindent [Lamport 1994] Lamport, Leslie: LaTeX - A Document Preparation System: User’s Guide and Reference Manual, Second Edition. Pearson / Prentice Hall, 1994. – ISBN 978–0–201–52983–8

exercises/literature/task.tex

@@ -2,17 +2,15 @@
   \item Use Google Scholar to retrieve Bib\TeX{} entries for the following \LaTeX{}
   handbooks:
   \begin{itemize}
-    \item Leslie Lamport (1994): \LaTeX. A Document Preparation System.
     \item Dilip Datta (2017): \LaTeX\ in 24 Hours. A Practical Guide for Scientific Writing.
     \item Frank Mittelbach / Michel Goossens (2002): Der \LaTeX-Begleiter.
   \end{itemize}
   \item Compare the entries with the results that \url{dblp.org} finds for the same titles.
-  \item Create a new Bib\TeX{} file called \file{literature.bib} in the 
-  \file{exercises/literature} folder.
+  \item Create a new Bib\TeX{} file called \file{literature.bib} in the \file{exercises/literature} folder.
   \item Add the Bib\TeX{} entries to the newly created Bib\TeX{} files. For this, select your preferred source among Google Scholar and dblp.
   \item Assign unique and meaningful Bib\TeX{} keys.
   \item Include the Bib\TeX{} file in a suitable location, where later on the references should be listed.
-  \item Cite the three handbooks in the 
+  \item Cite the two handbooks in the 
   file\\\file{exercises/literature/literature.tex}.
   \item Make use of the \mono{plain} biliography style.
   \item \textbf{Note}: If compiling fails, it may help to remove all auxiliary