4 http://hdl.handle.net/10338.dmlcz/153201 4 Combinatorial spectra using polynomials http://hdl.handle.net/10338.dmlcz/153202 Combinatorial spectra using polynomials Characteristic forms of complex Cartan geometries III: $G$-structures http://hdl.handle.net/10338.dmlcz/153200 Characteristic forms of complex Cartan geometries III: $G$-structures