Behtash, A., Dunne, G. V., Schäfer, T., Sulejmanpasic, T., & Ünsal, M. (2017). Toward Picard–Lefschetz theory of path integrals, complex saddles and resurgence. Annals of Mathematical Sciences and Applications, 2(1), https://doi.org/10.4310/amsa.2017.v2.n1.a3