SHREC 2021: Retrieval and classification of protein surfaces equipped with physical and chemical properties. - Andrea Raffo; Ulderico Fugacci; Silvia Biasotti; Walter Rocchia; Yonghuai Liu; Ekpo Otu; Reyer Zwiggelaar; David Hunter; Evangelia I. Zacharaki; Eleftheria Psatha; Dimitrios Laskos; Gerasimos Arvanitis; et al. (Comput. Graph., 2021)