Jeong-Hee Cha Gye-Young Kim Hyung-Il Choi Resolving Occlusion Method of Virtual Object in Simulation Using Snake and Picking Algorithm. 1-8 2007 conf/iccS/2007-2 International Conference on Computational Science (2) http://dx.doi.org/10.1007/978-3-540-72586-2_1 db/conf/iccS/iccS2007-2.html#ChaKC07