http://cfa-consulting.ch/dlfiles/Crypto_Guide_For_Investors_EN.pdf
“Mixed systems: some currencies are mixing these mechanisms, like Peercoin (PoW & PoS)
or Fluttercoin (all three systems). Developers working on these currencies think that by
mixing the technologies, they are mitigating the risks associated with any single one of them.”
“Peercoin. A combination
of PoS and PoW currency.
Slowly declining, small
community around it.”