Relaxation of electrical resistance and phase separation in ReBa₂Cu₃O₇-delta (Re = Y, Ho) single crystals strongly underdoped with oxygen - Zavgorodniy, A.A.; Vovk, R.V.; Obolenskii, M.A.; Nazyrov, Z.F.; Roshko, S.; Pinto Simoes, V.M. (Functional Materials, 2011)