Nicholas, Kenneth M. (1987). "Chemistry and synthetic utility of cobalt-complexed propargyl cations". Acc. Chem. Res. (Review). 20 (6): 207–214. doi:10.1021/ar00138a001.
Teobald, Barry J. (2002). "The Nicholas reaction: The use of dicobalt hexacarbonyl-stabilised propargylic cations in synthesis". Tetrahedron (Review). 58 (21): 4133–4170. doi:10.1016/S0040-4020(02)00315-0.
Connor, Richard E.; Nicholas, Kenneth M. (1977). "Isolation, characterization, and stability of α-[(ethynyl)dicobalt hexacarbonyl] carbonium ions". J. Organomet. Chem.125 (2): C45–C48. doi:10.1016/S0022-328X(00)89454-1.