Base Catalysis of Sodium Salts of [Ta6-xNbxO19]8- Mixed-Oxide Clusters. - Soichi Kikkawa; Mio Tsukada; Kanako Shibata; Yu Fujiki; Kazuki Shibusawa; Jun Hirayama; Naoki Nakatani; Takafumi Yamamoto; Seiji Yamazoe (Symmetry, 2021)