I'm looking for a definition of pseudo differential forms in ordinary differential geometry. However searching the web gave me nothing. There are definitions in supergeometry but that is not what I'm after.
Recently I read, that pseudo-differentialforms are the natural structure to integrate, since integration works on any kind of submanifold (orientation not required) for them, but those texts don't gave a 'clean' definition of these kind of forms.
What are pseudo-differentialforms?
Can pseudo differentialforms be defined as sections of some kind of fiber bundle? If yes that's a definition I would prefer.