The background method: theory and computations.
Philos Trans A Math Phys Eng Sci. 2022 Jun 13;380(2225):20210038. doi: 10.1098/rsta.2021.0038. Epub 2022 Apr 25.
Philos Trans A Math Phys Eng Sci. 2022.
PMID: 35465709
Review.