added pointer to:

- Theodor Bröcker, Tammo tom Dieck,
*Kobordismentheorie*, Lecture Notes in Mathematics**178**, Springer (1970) [ISBN:9783540053415]

added pointer to:

- Sergei Novikov, Section 4.3 in:
*Topology I – General survey*, in: Encyclopedia of Mathematical Sciences Vol. 12, Springer 1986 (doi:10.1007/978-3-662-10579-5, pdf)

the keyword “cobordism theory” used to redirect to the entry *cobordism*. While often the latter term is used as shorthand for the former, the entry “cobordism” is really just about the basic notion of cobordisms between manifolds, so redirecting “cobordism theory” to there wasn’t satisfactory.

So I gave it an entry in its own right, added a little Idea-section briefly surveying the scope of cobordism theory proper, copied over the relevant references:

Then I included (in that entry directly and into related entry as a “floating table of contents”) a list of pointers to related entries:

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