Fizika Tverdogo Tela, 1989 Volume 31, Issue 5,Pages 241–243(Mi ftt5360)
Do the superconducting properties of the $\mathrm{Ba}_{1-x}\mathrm{K}_{x}\mathrm{BiO}_{3-y}$ and $\mathrm{Ba}_{1-x}\mathrm{Rb}_{x}\mathrm{BiO}_{3-y}$ compounds determine the soft anharmonic modes ?