@article{munoz14higherorder,
    author = {Mu\~{n}oz, Adolfo},
    title = {Higher Order Ray Marching},
    journal = {Computer Graphics Forum},
    volume = {33},
    number = {8},
    issn = {1467-8659},
    url = {http://dx.doi.org/10.1111/cgf.12424},
    doi = {10.1111/cgf.12424},
    pages = {167--176},
    keywords = {volume rendering, rendering, ray marching, importance sampling, I.3.7 [Computer Graphics]: Colour, shading, shadowing, and texture I.3.7 [Computer Graphics]: Ray tracing},
    year = {2014},
    }

@inproceedings{Munoz12_ceig,
    author = {Mu\~noz, Adolfo},
    title = {Differential Ray Marching},
    booktitle = {Congreso Espa\~nol de Inform\'atica Gr\'afica},
    pages = {91--98},
    year = {2012},
    isbn = {978-3-905673-92-0},
    location = { Jaen, Spain }
}