@article{M Slowik2013, author = "J M Slowik and R Santra", title = "{An illustration of the chosen coordinates}", year = "2013", month = "8", url = "https://iop.figshare.com/articles/figure/_An_illustration_of_the_chosen_coordinates/1012415", doi = "10.6084/m9.figshare.1012415.v1" }