ELECTRON BEAM SOURCE MOLECULAR BEAM EPITAXY OF AlxGa1-xAs GRADED BAND GAP DEVICE STRUCTURES R.J. MALIK, A.F.J. LEVI, B.F. LEVINE, R.C. MILLER, D.V. LANG, L.C. HOPKINS et R.W. RYAN J. Phys. Colloques, 49 C4 (1988) C4-607-C4-614 DOI: 10.1051/jphyscol:19884127