TY - ECHAP AU - D. Hall AU - M. Matthews AU - Carl Wieman AU - Eric Cornell DA - 1999-01 N1 - JILA Pub. 6171 PB - Elsevier Science \& Technology Books PY - 1999 TI - Measurements of relative phase and quantum beat note between Bose-Einstein condensates SN - 044450091X, 9780444500915 ER -