TY - JOUR AU - A. Vitouchkine AU - James Faller BT - Metrologia DA - Jan-08-2004 DO - 10.1088/0026-1394/41/4/L01 PY - 2004 SP - L19 EP - L21 T2 - Metrologia TI - A direct and sensitive method for positioning the centre of mass of a dropping object at the optical centre of the enclosed corner cube in ballistic absolute gravimeters VL - 41 SN - 0026-1394 ER -