Haixia Du Hong Qin 0001 Free-Form Geometric Modeling by Integrating Parametric and Implicit PDEs. 549-561 2007 13 IEEE Trans. Vis. Comput. Graph. 3 https://doi.org/10.1109/TVCG.2007.1004 http://doi.ieeecomputersociety.org/10.1109/TVCG.2007.1004 https://www.wikidata.org/entity/Q33278193 db/journals/tvcg/tvcg13.html#DuQ07