TY - JOUR PB - American Physical Society ID - 10.1103/Physics.6.23 TI - Free-Falling Interferometry JF - Physics JA - Physics J1 - PHYSICS VL - 6 IS - SP - 23 EP - PY - 2013/02/25/ UR - http://link.aps.org/doi/10.1103/Physics.6.23 A1 - Arndt, Markus ER -