Reversible transitions in high - Tc cuprates based point contacts L. F. Rybaltchenko, N. L. Bobrov, V. V. Fisun, I. K. Yanson, A. G.M. Jansen and P. Wyder Eur. Phys. J. B, 10 3 (1999) 475-480 Published online: 15 August 1999 DOI: 10.1007/s100510050876