SHREC 2021: Retrieval of cultural heritage objects. - Ivan Sipiran; Patrick Lazo; Cristian Lopez; Milagritos Jimenez; Nihar Bagewadi; Benjamin Bustos; Hieu Dao; Shankar Gangisetty; Martin Hanik; Ngoc-Phuong Ho-Thi; Mike Holenderski; Dmitri Jarnikov; et al. (Comput. Graph., 2021)