1. P. M. Akhmet’ev and P. J. Eccles, “The relationship between framed bordism and skew-framed bordism,” Bull. London Math. Soc., 39, No. 3, 473–481 (2007).
2. P. Akhmetiev and O. Frolkina, “On non-immersibility of ℝP10 to ℝ15,” Topol. Its Appl., 160, No. 11, 1241–1254 (2013).
3. P. Akhmetiev and O. Frolkina, “On properties of skew-framed immersions cobordism groups,” Fundam. Prikl. Mat., 21, No. 5, 19–46 (2016).
4. P. J. Eccles, “Multiple points of codimension one immersions,” in: Topology Symposium, Siegen 1979, Lect. Notes Math., Vol. 788, Springer, Berlin (1980), pp. 23–38.
5. P. J. Eccles and M. Grant, “Bordism classes represented by multiple point manifolds of immersed manifolds,” Tr. Mat. Inst. Steklova, 252, 55–60 (2006).