Giusfredi G, De Natale P, Mazzotti D, Inguscio M, Cancio P
helium spectroscopy frequency metrology QED
@misc{oai:it.cnr:prodotti:131753, title = {Absolute frequency measurements in visible helium transitions: Tests of bound two-electron QED}, author = {Giusfredi G and De Natale P and Mazzotti D and Inguscio M and Cancio P}, year = {2006} }