+* <http://bugs.libre-riscv.org/buglist.cgi?columnlist=assigned_to%2Cbug_status%2Cresolution%2Cshort_desc%2Ccf_budget&f1=cf_nlnet_milestone&o1=equals&query_format=advanced&resolution=---&v1=NLnet.2019.02>
+* <https://pdfs.semanticscholar.org/5060/4e9aff0e37089c4ab9a376c3f35761ffe28b.pdf>
+* <http://www.acsel-lab.com/arithmetic/arith15/papers/ARITH15_Takagi.pdf>
+* <https://youtu.be/o5Ihqg72T3c>
+* <http://flopoco.gforge.inria.fr/>
+* Fundamentals of Modern VLSI Devices <https://groups.google.com/a/groups.riscv.org/d/msg/hw-dev/b4pPvlzBzu0/7hDfxArEAgAJ>