In Ferrari and Robertson we find mentioned the work by , who showed the main Raman features of aromatic oligomers as possessing the same symmetries, E2g and A1g , of graphite. "They also showed that the eigenvectors of these oligomers or clusters can be mapped onto those of graphite phonons along the direction GKM. In particular, … (see the discussion in Ferrari and Robertson) … This indicates that aromatic clusters can be considered as a part of a graphite superlattice, both electronically and vibrationally. This simultaneous mapping means that the behavior and dispersion of the D and G peaks in graphite also holds for aromatic oligomers and clusters in disordered carbon" . Let us return to Ferrari and Robertson, and to their point of view about the practical Raman spectroscopy.