Some document
  
Hans Petter Langtangen [1, 2]
[1] Center for Biomedical Computing, Simula Research Laboratory
[2] Department of Informatics, University of Oslo
Mar 31, 2015
 
Table of contents
 Equations 
 References 
This is just a fake chapter used to exemplify cross referencing
across chapters.
  
Equations
Here is the world's most famous equation:
$$
\begin{equation}
E = mc^2
\tag{1}
\end{equation}
$$
It is mentioned here so that we can refer to it from another document,
typically 
the document Directory and file structure
[1].
References 
 -   H. P. Langtangen. 
    Directory and file structure,
    http://hplgit.github.io/setup4book-doconce/doc/pub/rules/html.