TY - RPRT TI - Two-photon exchange and elastic electron-proton scattering. AU - P G Blunden AU - W Melnitchouk AU - J A Tjon PY - 2003 DO - 10.1103/physrevlett.91.142304 UR - https://pubmed.ncbi.nlm.nih.gov/14611520/ ID - 14611520 ER -