1. Agrachev, A.A.: Rolling balls and octonions. Proc. Steklov Inst. Math. 258(1), 13–22 (2007).
arXiv:math/0611812
2. Agrachev, A.A., Sachkov, Yu.L.: An intrinsic approach to the control of rolling bodies. In: Proceedings of the 38th IEEE Conference on Decision and Control, vol. 1, pp. 431–435. IEEE, Piscataway (1999)
3. Agricola, I.: Old and new on the exceptional group G$$_2$$. Notices Amer. Math. Soc. 55(8), 923–929 (2008).
http://www.ams.org/notices/200808/tx080800922p.pdf
4. Ambrose, W., Singer, I.M.: A theorem on holonomy. Trans. Amer. Math. Soc. 75(3), 428–443 (1953).
http://www.ams.org/journals/tran/1953-075-03/S0002-9947-1953-0063739-1/S0002-9947-1953-0063739-1.pdf
5. An, D., Nurowski, P.: Twistor space for rolling bodies (2012).
arXiv:1210.3536