A.I. Akimenko and V.A. Gudimenko, Possibility of a s-wave pairing in heavily Zn-doped YBa₂Cu₃O_7-d based on magnetic field effect on Andreev reflection spectra, Low Temp. Phys. 34, (2008) [Fiz. Nizk. Temp. 34, 1122-1126, (2008)] DOI: https://doi.org/10.1063/1.3009579.