External documentation
----------------------
-- [The mathematics of
-Raid6](https://www.kernel.org/pub/linux/kernel/people/hpa/raid6.pdf)
-by H. Peter Anvin
-
- [Effective Erasure Codes for reliable Computer Communication
Protocols](http://info.iet.unipi.it/~luigi/fec_ccr.ps.gz) by Luigi
Rizzo