@article{JGG_2007_11_2_JGG_2007_11_2_a8,
     author = {K. Kondo and T. Nishita and H. Sato and K. Matsuda },
     title = {An {Educational} {Non-Photorealistic} {Rendering} {System} {Using} {2D} {Images} by {Java} {Programming}},
     journal = {Journal for geometry and graphics},
     pages = {237--247},
     publisher = {mathdoc},
     volume = {11},
     number = {2},
     year = {2007},
     url = {http://geodesic.mathdoc.fr/item/JGG_2007_11_2_JGG_2007_11_2_a8/}
}