@article{KJM_2010_34_1_a0,
     author = {Bart Ons and Paul Verstraelen},
     title = {A geometrical description of visual sensation {II}},
     journal = {Kragujevac Journal of Mathematics},
     pages = {5 - 24},
     publisher = {mathdoc},
     volume = {34},
     number = {1},
     year = {2010},
     url = {http://geodesic.mathdoc.fr/item/KJM_2010_34_1_a0/}
}