.. !split

Bibliography
============

.. [Ref1]
   **H. P. Langtangen**. Finite difference methods for wave motion,
   `http://tinyurl.com/k3sdbuv/pub/wave <http://tinyurl.com/k3sdbuv/pub/wave>`_.

.. [Ref2]
   **H. P. Langtangen**. *Scaling of Differential Equations*,
   2015,
   `http://tinyurl.com/qfjgxmf/web <http://tinyurl.com/qfjgxmf/web>`_.