Forward Raman scattering in GaAs/AlAs superlattices: Study of optical phonon anisotropyD. A. Tenne, V. A. Haisler, N. T. Moshegov, A. I. Toropov, A. P. Shebanin and D. R.T. ZahnEur. Phys. J. B, 8 3 (1999) 371-376DOI: https://doi.org/10.1007/s100510050702