OPTICAL PHONON AND ENERGY-GAP SPECTROSCOPY IN YBA2CU3OX by Agladze, N, Boldirev, N, Burlakov, V, Chepurko, G, Denisov, V, Kiselev, S, Kuzik, L, Lerner, I, Lozovik, Y, Mavrin, B, Podobedov, V, Popova, M, Shulga, S, Yakovlev, V, Zhizhin, G