Manifolds, Transversality, and de Rham Cohomology by Peter Petersen
= Manifolds, Transversality, and de Rham Cohomology by Peter Petersen
{c}
{tag=Work by Peter Petersen}
Author-hosted text: https://www.math.ucla.edu/~petersen/manifolds.pdf
Cited passage: section3.3, Theorem3.3.4 (Ehresmann), printed pages63–64 in the current author-hosted version. No publication date is inferred.