Bott, S., ATWOOD, J., BOTT, S., ROBINSON, K., BISHOP, E., & MAY, M. (1991). Preparation and X-ray structure of [H3O+�18-crown-6]-[(H5O 2 + )(Cl?)2], a compound containing both H3O+ and H5O 2 + crystallized from aromatic solution. Journal of Crystallographic and Spectroscopic Research, 21(4), pp. 459-462. doi:10.1007/BF01160659

Bott, Simon, JL ATWOOD, SG BOTT, KD ROBINSON, EJ BISHOP, and MT MAY. "Preparation and X-ray Structure of [H3O+�18-crown-6]-[(H5O 2 + )(Cl?)2], a Compound Containing Both H3O+ and H5O 2 + Crystallized From Aromatic Solution." Journal of Crystallographic and Spectroscopic Research 21, no. 4 (1991): 459-462.

Bott, Simon, et al. "Preparation and X-ray Structure of [H3O+�18-crown-6]-[(H5O 2 + )(Cl?)2], a Compound Containing Both H3O+ and H5O 2 + Crystallized From Aromatic Solution." Journal of Crystallographic and Spectroscopic Research 21.4 (1991): 459-462.