.. _Numpy: http://www.numpy.org
.. _scikit-image: http://scikit-image.org/docs/stable/
.. _Scipy: https://www.scipy.org
.. _Cython: http://cython.org
.. _Pywavelets: https://pywavelets.readthedocs.io/en/latest/
.. _PyCifRW: http://www.iucr.org/resources/cif/software/pycifrw