# References

* Sovereign.xyz - [\[1\]](https://www.sovereign.xyz/)
* ZEX Token Whitepaper  - [\[2\]](https://zeta-foundation.gitbook.io/zeta-foundation/whitepaper)
* Nearly Optimal State Merklization - [\[3\]](https://sovereign.mirror.xyz/jfx_cJ_15saejG9ZuQWjnGnG-NfahbazQH98i1J3NN8)
* Optimistic Rollup Challenge Period - [\[4\]](https://kelvinfichter.com/pages/thoughts/challenge-periods/)
* Fast Withdrawals In Optimistic Rollups - [\[5\]](https://medium.com/tokamak-network/fast-withdrawals-in-optimistic-rollups-part-2-db27426d04af)