Double-Oxalate-Bridged TiIV–ZrIV-Heterometal Incorporated Germanotungstate for Condensation Reactions of Aldehydes and Malononitrile Accompanying the C═C Bond Formation pubs.acs.org/doi/10.1021/... Zhao, Yang, and co-workers @InorgChem #titanium #zirconium #germanotungstate