@article{JGG_2006_10_1_JGG_2006_10_1_a8,
     author = {E. Toledo Santos and L. Lourenzoni and A. L. Lima de Oliveira },
     title = {RISKO, an {Educational} {Geometry} {Drawing} {Software} {With} an {Innovative} {Interface}},
     journal = {Journal for geometry and graphics},
     pages = {115--124},
     publisher = {mathdoc},
     volume = {10},
     number = {1},
     year = {2006},
     url = {http://geodesic.mathdoc.fr/item/JGG_2006_10_1_JGG_2006_10_1_a8/}
}