Valence- and conduction-band structure of the sapphire (11¯02) surface

W. J. Gignac, R. Stanley Williams, Steven P. Kowalczyk
1985 Physical Review B (Condensed Matter)  
doi:10.1103/physrevb.32.1237 pmid:9937137 fatcat:llffkdcscjhynmvpehjjkgkxpi