Fizika Tverdogo Tela, 1990 Volume 32, Issue 9,Pages 2558–2562(Mi ftt6359)
Hydrostatic pressure effect on ultrasound damping anomalies in the incommensurate phase of $\{\mathrm{N}(\mathrm{CH}_{3})_{4}\}_{2}\mathrm{XCl}_{4}(\mathrm{X}=\mathrm{Zn},\mathrm{Mn})$