@article{Liu2019, author = "Ke Liu", title = "{Pattern Exploration from Citizen Geospatial Data}", year = "2019", month = "1", url = "https://hammer.purdue.edu/articles/thesis/Pattern_Exploration_from_Citizen_Geospatial_Data/7429991", doi = "10.25394/PGS.7429991.v1" }