Eliashberg, Y., and N. M. Mishachev. “Wrinkling of Smooth Mappings III. Foliations of Codimension Greater Than One”. Topological Methods in Nonlinear Analysis, vol. 11, no. 2, June 1998, pp. 321-50, https://apcz.umk.pl/TMNA/article/view/TMNA.1998.021.