Talk:Secondary cohomology operation

Material to include
This article could be expanded to include material from the following references Wundzer (talk) 18:54, 2 February 2021 (UTC)
 * [Massey higher products - David Kraines | https://www.ams.org/journals/tran/1966-124-03/S0002-9947-1966-0202136-1/S0002-9947-1966-0202136-1.pdf]
 * In particular, the lemmas later on in relation to the product $$\langle u \rangle^k$$ have a motivic analogue and are used in the proof of Bloch-Kato. https://arxiv.org/abs/0805.4430