George Andrew Olah (1972). "Stable carbocations. CXVIII. General concept and structure of carbocations based on differentiation of trivalent (classical) carbenium ions from three-center bound penta- of tetracoordinated (nonclassical) carbonium ions. Role of carbocations in electrophilic reactions". J. Am. Chem. Soc.94 (3): 808–820. doi:10.1021/ja00758a020.
Doo Wan Boo and Yuan T. Lee (1995), "Infrared spectroscopy of the molecular hydrogen solvated carbonium ions, CH+ 5(H 2)n (n=1–6)". J. Chem. Phys. volume 103, page 520; எஆசு:10.1063/1.470138
L. I. Yeh, J. M. Price, and Y. T. Lee (1989), "Infrared spectroscopy of the pentacoordinated carbonium ion C 2H+ 7". Journal of the American Chemical Society, volume 111, pages 5591-5604. எஆசு:10.1021/ja00197a015
