On Trip Planning Queries in Spatial Databases. - Feifei Li 001; Dihan Cheng; Marios Hadjieleftheriou; George Kollios; Shang-Hua Teng (SSTD, 2005)

Trip Planning Queries in Road Network Databases. - Feifei Li 001; Marios Hadjieleftheriou; George Kollios; Dihan Cheng; Shang-Hua Teng (Encyclopedia of GIS, 2008)

Trip Planning Queries in Road Network Databases. - Feifei Li 001; Marios Hadjieleftheriou; George Kollios; Dihan Cheng; Shang-Hua Teng (Encyclopedia of GIS, 2017)