Bott, S., ATWOOD, J., BOTT, S., JUNK, P., & MAY, M. (1995). Liquid clathrate media containing transition metal halocarbonyl anions; formation and crystal structures of [K+ · 18-crown-6][Cr(CO)5Cl], [H3O+ · 18-crown-6][W(CO)5Cl], [H3O+ · 18-crown-6][W(CO)4Cl3], and [H2O · bis-aza-18-crown-6 · (H+)2][W(CO)4Cl3]2. Journal of Organometallic Chemistry, 487(1-2), pp. 7-15. doi:10.1016/0022-328X(94)05072-J

Bott, Simon, JL ATWOOD, SG BOTT, PC JUNK, and MT MAY. "Liquid Clathrate Media Containing Transition Metal Halocarbonyl Anions; Formation and Crystal Structures of [K+ · 18-crown-6][Cr(CO)5Cl], [H3O+ · 18-crown-6][W(CO)5Cl], [H3O+ · 18-crown-6][W(CO)4Cl3], and [H2O · Bis-aza-18-crown-6 · (H+)2][W(CO)4Cl3]2." Journal of Organometallic Chemistry 487, no. 1-2 (1995): 7-15.

Bott, Simon, et al. "Liquid Clathrate Media Containing Transition Metal Halocarbonyl Anions; Formation and Crystal Structures of [K+ · 18-crown-6][Cr(CO)5Cl], [H3O+ · 18-crown-6][W(CO)5Cl], [H3O+ · 18-crown-6][W(CO)4Cl3], and [H2O · Bis-aza-18-crown-6 · (H+)2][W(CO)4Cl3]2." Journal of Organometallic Chemistry 487.1-2 (1995): 7-15.