Hongli Liu Feng Qiu Linlin Wang Haipeng Shi The Implementation of the Virtual Tourism Teaching System. 225-228 2009 ISCID (2) https://doi.org/10.1109/ISCID.2009.203 https://doi.ieeecomputersociety.org/10.1109/ISCID.2009.203 conf/iscid/2009 db/conf/iscid/iscid2009-2.html#LiuQWS09