Dependence of the direct energy gap of GaAs on hydrostatic pressureBenjamin WelberManuel Cardonaet al.1975Physical Review B
Dependence of the indirect energy gap of silicon on hydrostatic pressureB. WelberC.K. Kimet al.1975Solid State Communications
Effects of resonant phonon interactions on shapes of impurity absorption linesSergio RodriguezTheodore D. Schultz1969Physical Review