Citation: A. Noack et al., Ring transformations of bicyclic cycloalka[d]- to the isomeric cycloalka[c]isothiazolium salts and their oxidation to omega-(2-aryl-1,1,3-trioxo-2,3-dihydro-1H-isothiazol-4-yl)-alkanoic acids, J PRAK CHEM, 342(7), 2000, pp. 675-681