TY - JOUR AU - W. Baylis BT - Physics Letters A DA - Jan-03-1968 DO - 10.1016/0375-9601(68)90250-8 PY - 1968 SP - 414 EP - 415 T2 - Physics Letters A TI - Optical-pumping effects in level-crossing measurements UR - http://linkinghub.elsevier.com/retrieve/pii/0375960168902508 VL - 26 SN - 03759601 ER -