add reference in README

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Floris van Doorn 2017-07-04 17:14:28 +01:00 committed by GitHub
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@ -26,7 +26,7 @@ These projects are mostly done
- We construct the Atiyah-Hirzebruch and Serre spectral sequences for cohomology.
### Future directions
- Hurewicz Theorem and Hurewicz theorem modulo a Serre class.
- Hurewicz Theorem and Hurewicz theorem modulo a Serre class. There is a proof in Hatcher. Also, [this](http://www.math.uni-frankfurt.de/~johannso/SkriptAll/SkriptTopAlg/SkriptTopCW/homotop12.pdf) might be useful.
- Homological Serre spectral sequence.
- Interaction between steenrod squares and cup product with spectral sequences
- ...