Bott, S., ATWOOD, J., BOTT, S., MEANS, C., COLEMAN, A., ZHANG, H., & MAY, M. (1990). Synthesis of salts of the hydrogen dichloride anion in aromatic solvents. 2. Syntheses and crystal structures of [K.cntdot.18-crown-6][Cl-H-Cl], [Mg.cntdot.18-crown-6][Cl-H-Cl]2, [H3O.cntdot.18-crown-6][Cl-H-Cl], and the related [H3O.cntdot.18-crown-6][Br-H-Br]. Inorganic Chemistry, 29(3), pp. 467-470. doi:10.1021/ic00328a025

Bott, Simon, JL ATWOOD, SG BOTT, CM MEANS, AW COLEMAN, HM ZHANG, and MT MAY. "Synthesis of Salts of the Hydrogen Dichloride Anion in Aromatic Solvents. 2. Syntheses and Crystal Structures of [K.cntdot.18-crown-6][Cl-H-Cl], [Mg.cntdot.18-crown-6][Cl-H-Cl]2, [H3O.cntdot.18-crown-6][Cl-H-Cl], and the Related [H3O.cntdot.18-crown-6][Br-H-Br]." Inorganic Chemistry 29, no. 3 (1990): 467-470.

Bott, Simon, et al. "Synthesis of Salts of the Hydrogen Dichloride Anion in Aromatic Solvents. 2. Syntheses and Crystal Structures of [K.cntdot.18-crown-6][Cl-H-Cl], [Mg.cntdot.18-crown-6][Cl-H-Cl]2, [H3O.cntdot.18-crown-6][Cl-H-Cl], and the Related [H3O.cntdot.18-crown-6][Br-H-Br]." Inorganic Chemistry 29.3 (1990): 467-470.