Add info about published paper

README.md

-# Jackknife
+# jackknife
 
 General implementation of jackknife resampling with extension module and script for
 jackknifing self-energies and susceptibilites calculated with
 [AbinitioDGA](https://github.com/AbinitioDGA/ADGA).
 
+**In any published papers arising from the use of jackknife, please cite:**
+
+Patrick Kappl, Markus Wallerberger, Josef Kaufmann, Matthias Pickem, Karsten Held,  
+Phys. Rev. B 102, 085124 (2020)  
+https://doi.org/10.1103/PhysRevB.102.085124  
+[arXiv:2005.04899](https://arxiv.org/abs/2005.04899)  
+When using additional codes (like [w2dynamics](https://github.com/w2dynamics/w2dynamics)
+and [ADGA](https://github.com/AbinitioDGA/ADGA)) in conjunction with **jackknife**, do not
+forget to give credit to them as well.
+
 For more information read the documentation: https://patrickkappl.gitlab.io/jackknife/
 
 ## License

doc/source/getting_started.rst

@@ -32,14 +32,15 @@ samples are needed, you have to use worm sampling to generate the desired number
 2-particle Green's functions. The more worm samples you use, the better your statistics
 will get.
 
+.. _ADGA: https://github.com/AbinitioDGA/ADGA
 .. _w2dynamics: https://github.com/w2dynamics/w2dynamics
 
 
 Installation
 ************
 
-:program:`jackknife` is written in Python 3, but also works with Python 2.7 and requires
-the following packages.
+:program:`jackknife` is written in Python 3, but should also work with Python 2.7 and
+requires the following packages.
 
    - NumPy (1.16.2)
    - h5py (1.10.2)
@@ -82,7 +83,7 @@ specified, but the ``2PFile`` and ``Outfile`` key will be set automatically by t
 according to the values given in the :program:`jackknife` config file. For further details
 on the files regarding :program:`ADGA` and :program:`w2dynamics`, see their respective documentation.
 
-Jackknife config file
+jackknife config file
 ---------------------
 
 An example of a :program:`jackknife` config file is provided in the code repository
@@ -134,8 +135,8 @@ Output
 ======
 
 The output is written to an HDF5 file named according to the ``output_file_prefix`` set in
-the :ref:`jackknife config file <Jackknife config file>` with the date and time of the
-calculation appended to it. The exact structure is as follows::
+the :ref:`jackknife config file` with the date and time of the calculation appended to it.
+The exact structure is as follows::
 
    `output_file_prefix`_<YYYY-mm-dd_HH-MM-SS>.hdf5
          ├── .config