[1]
H. Kodama and P. W. Michor, “The Homotopy Type of the Space of Degree 0 — Immersed Plane Curves”, Rev. mat. complut., vol. 19, no. 1, pp. 227–234, Apr. 2006, doi: 10.5209/rev_REMA.2006.v19.n1.16660.