https://www.arxiv.org/abs/1407.0987
Abstract page for arXiv paper 1407.0987: World-line instantons and the Schwinger effect as a WKB exact path integral
world lineschwinger effectinstantons
https://www.arxiv.org/abs/1012.4468
Abstract page for arXiv paper 1012.4468: From SO/Sp instantons to W-algebra blocks
w algebraspinstantonsblocks