Frenking, Gernot and Tonner, Ralf. "Divalent carbon(0) compounds" Pure and Applied Chemistry, vol. 81, no. 4, 2009, pp. 597-614. https://doi.org/10.1351/PAC-CON-08-11-03
Frenking, G. and Tonner, R. (2009) Divalent carbon(0) compounds. Pure and Applied Chemistry, Vol. 81 (Issue 4), pp. 597-614. https://doi.org/10.1351/PAC-CON-08-11-03
Frenking, Gernot and Tonner, Ralf. "Divalent carbon(0) compounds" Pure and Applied Chemistry 81, no. 4 (2009): 597-614. https://doi.org/10.1351/PAC-CON-08-11-03