@article{813586, author = {S Bergeson and A Balakrishnan and K Baldwin and Thomas Lucatorto and J Marangos and T McIlrath and Thomas O'Brian and S Rolston and Craig Sansonetti and J Wen and N Westbrook and C Cheng and E Eyler}, title = {Measurement of the He Ground State Lamb Shift via the Two-Photon 11S-21S Transition: a new approach for testing QED at order α4 Ry and beyond}, year = {1998}, number = {80}, month = {1998-01-01 00:01:00}, publisher = {Physical Review Letters}, language = {en}, }