Fizika Tverdogo Tela, 1989 Volume 31, Issue 4,Pages 74–81(Mi ftt5270)
X-ray diffraction study of distorted surface layers of $\mathrm{Si} (111)$ and $\mathrm{In}_{0.5}\mathrm{Ga}_{0.5}\mathrm{P}/\mathrm{GaAs} (111)$ basing on the constant strain gradient model