TY - GEN AU - K. Andres, BS. Chandrasekhar T1 - PINNING FORCES AND LOWER CRITICAL FIELDS IN YBA2CU3O7 CRYSTALS - TEMPERATURE-DEPENDENCE AND ANISOTROPY - COMMENT CY - PY - 1991 PB - T3 - Physical Review Letters VL - 67 UR - http://dx.doi.org/10.1103/PhysRevLett.67.1473 SN - 0031-9007