Differentiability along one-parameter subgroups compared to differentiability on Lie groups as manifolds
N. Nikitin, in: 50th Seminar “Sophus Lie”, Bdlewo, Poland, September 26 – October 1, 2016. Dedicated to Professor Karl Heinrich Hofmann on the Occasion of His 85th Birthday, Warsaw: Polish Academy of Sciences, Institute of Mathematics, 2017, pp. 363–373.