Guohui Li 0001 Yanhong Li LihChyun Shu Ping Fan CkNN Query Processing over Moving Objects with Uncertain Speeds in Road Networks. 65-76 2011 APWeb https://doi.org/10.1007/978-3-642-20291-9_9 conf/apweb/2011 db/conf/apweb/apweb2011.html#LiLSF11