Editing Differential topology (section)

== References ==
*{{cite book |title = A First Course in Geometric Topology and Differential Geometry| url=https://archive.org/details/firstcourseingeo0000bloc| url-access=registration|first = Ethan D.|last = Bloch | year = 1996 |location=Boston |publisher=Birkhäuser |isbn=978-0-8176-3840-5 }}
*{{cite book |title = Differential Topology|author-link=Morris Hirsch|first = Morris|last = Hirsch|publisher=Springer-Verlag|year=1997|isbn = 978-0-387-90148-0}}
*{{cite journal|last=Lashof|first=Richard|author-link=Richard Lashof|title=The Tangent Bundle of a Topological Manifold|journal=[[American Mathematical Monthly]]|date=Dec 1972|volume=79|issue=10|pages=1090–1096|jstor=2317423|doi=10.2307/2317423}}
*{{cite journal|last=Kervaire|first=Michel A.|author-link=Michel Kervaire|title=A manifold which does not admit any differentiable structure|journal=[[Commentarii Mathematici Helvetici]]|date=Dec 1960|volume=34|issue=1|pages=257–270|doi=10.1007/BF02565940}}