Étienne Ghys, Sergei Tabachnikov, Vladen Timorin: Osculating curves: around the Tait-Kneser theorem. The Mathematical Intelligencer, 2013, 35. vsk, nro 1, s. 61–66. doi:10.1007/s00283-012-9336-6MR:3041992arXiv:1207.5662
arxiv.org
Étienne Ghys, Sergei Tabachnikov, Vladen Timorin: Osculating curves: around the Tait-Kneser theorem. The Mathematical Intelligencer, 2013, 35. vsk, nro 1, s. 61–66. doi:10.1007/s00283-012-9336-6MR:3041992arXiv:1207.5662
doi.org
dx.doi.org
Étienne Ghys, Sergei Tabachnikov, Vladen Timorin: Osculating curves: around the Tait-Kneser theorem. The Mathematical Intelligencer, 2013, 35. vsk, nro 1, s. 61–66. doi:10.1007/s00283-012-9336-6MR:3041992arXiv:1207.5662
Jaakko Forsman, J. A. Wecksell, I. Havu, Hannes Salovaara: ”Evoluutta”, Pieni tietosanakirja, 1. osa (A - Isonzo), s. 851. Otava, 1925. Teoksen verkkoversio.