Fizika Tverdogo Tela, 1990 Volume 32, Issue 1,Pages 318–321(Mi ftt5900)
Short Notes
On a displacement phase transition in $\mathrm{K}_{2}\mathrm{NiF}_{4}$ crystals. comparison of $\mathrm{La}_{2}\mathrm{CuO}_{4}$ and $\mathrm{La}_{2}\mathrm{NiO}_{4}$