TY - JOUR AU - I Barbee AU - Marvin Cohen AU - David Penn C2 - Physics Letters A DA - 1991-01-01 00:01:00 LA - en M1 - 161 PB - Physics Letters A PY - 1991 TI - Limitations on a Combined Phonon -- Non-Phonon Mechanism for Superconductivity Bi2Sr3Ca1Cu2Ox ER -