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A.I. D`yachenko, V.Yu. Tarenkov, R. Szymczak, H. Szymczak, A.V. Abal`oshev, S.J. Lewandowski, and L. Leonyuk, ab-plane tunneling and Andreev spectroscopy of superconducting gap an pseudogap in , Low Temp. Phys. 29, 108–112 , (2003) [Fiz. Nizk. Temp. 29, 149-155, (2003)] DOI: https://doi.org/10.1063/1.1542408.