First-order Raman spectra from In1-x-yGaxAlyAs epitaxial layers grown on InP substrates M. M. Bülbül, G. D. Farrant and S. R.P. Smith Eur. Phys. J. B, 24 1 (2001) 3-6 Published online: 15 November 2001 DOI: 10.1007/s100510170015