High temperature phase transitions in the crystal of p-trimethylammoniumbenzenesulfonate zwitterion J. Even, M. Bertault, L. Toupet, A. Girard and W. J. Kusto Eur. Phys. J. B, 12 4 (1999) 479-491 Published online: 15 December 1999 DOI: 10.1007/s100510051029