Turchin, Victor Max Planck Institute for Mathematics, Max Planck Society;
https://doi.org/10.1353/ajm.2018.0006 (Publisher version)
ArXiv_1409.0163.pdf (Preprint), 283KB
Turchin, V., & Willwacher, T. (2018). Relative (non-)formality of the little cubes operads and the algebraic Cerf lemma. American Journal of Mathematics, 140(2), 277-316. doi:10.1353/ajm.2018.0006.