@article{JGG_2007_11_1_JGG_2007_11_1_a9,
     author = {F. Okabe and K. Nakamaru and Y. Ohno },
     title = {Expression of {Lines} {Drawn} by {Chalks} {Based} on {Scanned} {Images}},
     journal = {Journal for geometry and graphics},
     pages = {105--11},
     publisher = {mathdoc},
     volume = {11},
     number = {1},
     year = {2007},
     url = {http://geodesic.mathdoc.fr/item/JGG_2007_11_1_JGG_2007_11_1_a9/}
}