@article{separable-w,
    author = {Merry, Bruce},
    title = {Approximating W projection as a separable kernel},
    volume = {456},
    number = {2},
    pages = {1761--1766},
    year = {2016},
    doi = {10.1093/mnras/stv2761},
    URL = {http://mnras.oxfordjournals.org/content/456/2/1761.abstract},
    eprint = {http://mnras.oxfordjournals.org/content/456/2/1761.full.pdf+html},
    journal = {Monthly Notices of the Royal Astronomical Society} 
}