The 'resources' section of the post has 2 links, e.g. www.ma.utexas.edu/mp_arc/e/03-547.pdf goes through several rather clever transformations of (spatial and/

The 'resources' section of the post has 2 links, e.g. www.ma.utexas.edu/mp_arc/e/03-547.pdf goes through several rather clever transformations of (spatial and/or time) variables to improve accuracy.