Shultz DA, Bodnar SH, Kumar RK, Lee H, Kampf JW. Molecular structures of carbonyl-linked bis(dioxolene) complexes: can a carbonyl group act as an effective ferromagnetic coupler? Inorg Chem. 2001 Jan 29;40(3):546–9. doi: 10.1021/ic000956a. PMID: 11209614.