Strazzolini, P., Gambi, A., Giumanini, A. G. (1998). The reaction between ethanedioyl (oxalyl) dihalides and Ag2C2O4: a route to Staudinger’s elusive ethanedioic (oxalic) acid anhydride. Journal of the Chemical Society, Perkin Transactions 11998 (16): 2553–2558. DOI: 10.1039/a803430c.
Gambi, A., Guimanini, A. G., Strazzolini, P. (2001). Theoretical investigations on (CO)n(CO2)m cyclic cooligomers. Journal of Molecular Structure: THEOCHEM536 (1): 9–16. DOI: 10.1016/S0166-1280(00)00601-1.