Fizika Tverdogo Tela, 1991 Volume 33, Issue 10,Pages 2896–2906(Mi ftt7114)
Correlation of inhomogeneities in the superconducting properties with the variation of the lattice parameter $C$ in nontwinning $\mathrm{YBa}_{2}\mathrm{Cu}_{3-z}\mathrm{Al}_{y}\mathrm{O}_{6+x}$ crystals