@article{satherley:2001,
        author={Richard Satherley and Mark W. Jones},
        title={Vector-City Vector Distance Transform},
        year=2001,
        journal={Computer Vision and Image Understanding},
        volume=82,
        pages={238--254},
        issn={1077-3142},
        pdfurl={http://cs.swan.ac.uk/~csmark/PDFS/cviu.pdf},
}