Viz Obrázek 8.1 v knize „Perturbation Methods“.HINCH, E.J. Perturbation Methods. [s.l.]: Cambridge University Press, 1991. (Cambridge Texts in Applied Mathematics). Dostupné online. ISBN0-521-37897-4. S. 146.
doi.org
dx.doi.org
MERCER, G.N.; ROBERTS, A.J. A centre manifold description of contaminant dispersion in channels with varying flow properties. [s.l.]: [s.n.], 1990. DOI10.1137/0150091. S. 1547–1565.
google.com.ph
books.google.com.ph
Mathematical Analysis-II. [s.l.]: Krishna Prakashan Media Dostupné online. (anglicky)