TY - CONF AU - Bergeson, S AU - Balakrishnan, A AU - Baldwin, K AU - Lucatorto, Thomas C2 - Int. Symp. Reson. Ion., Penn State, 1, NY DA - 1996-01-01 00:01:00 LA - en PB - Int. Symp. Reson. Ion., Penn State, 1, NY PY - 1996 TI - Doppler-free RIS of the He 1s2 1s - 1s2s 1S Transition at 120.4 nm, ER -