TY - JOUR AU - D. Hall AU - M. Matthews AU - Carl Wieman AU - Eric Cornell BT - Physical Review Letters DA - 1998-08 DO - 10.1103/PhysRevLett.81.1543 PY - 1998 SP - 1543 EP - 1546 T2 - Physical Review Letters TI - Measurements of Relative Phase in Two-Component Bose-Einstein Condensates VL - 81 SN - 0031-9007 ER -