TY  - RPRT
TI  - Contributions to the binding, two-loop correction to the Lamb shift.
AU  - K Pachucki
PY  - 1993
DO  - 10.1103/physreva.48.2609
UR  - https://pubmed.ncbi.nlm.nih.gov/9909910/
ID  - 9909910
ER  -