Improved electronic properties of GaAs surfaces stabilized with phosphorus - Viktorovitch, P.; Gendry, M.; Krawczyk, S. K.; Krafft, F.; Abraham, P.; Bekkaoui, A.; Monteil, Y. (American Institute of Physics (AIP), 1991)
http://dx.doi.org/10.1063/1.104879
Keywords: U