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THz phonon spectroscopy studies of Bi-2223 and Bi- 2212 in a frequency range up to 25 THz are overviewed. The observed giant instability of I(V) – characteristics of Bi-2223 and Bi-2212 nanosteps is probably caused by emission of coherent 2delta – optical phonons in a process of resonant recombination of nonequilibrium quasiparticles.