diff --git a/content/notes/blockchain-project.md b/content/notes/blockchain-project.md
index 2736215da..f2fb4125c 100644
--- a/content/notes/blockchain-project.md
+++ b/content/notes/blockchain-project.md
@@ -76,6 +76,7 @@ Blockchain technology falls into two distinct classes: open (permissionless) blo
 - H. M. Kim, H. Turesson, M. Laskowski and A. F. Bahreini, "Permissionless and Permissioned, Technology-Focused and Business Needs-Driven: Understanding the Hybrid Opportunity in Blockchain Through a Case Study of Insolar," in IEEE Transactions on Engineering Management, vol. 69, no. 3, pp. 776-791, June 2022, doi: 10.1109/TEM.2020.3003565.
 - https://doi.org/10.1016/j.future.2019.02.059 Fork-free hybrid consensus with flexible Proof-of-Activity
 - Digital Object Identifier 10.1109/TII.2019.2941735 zkCrowd: A Hybrid Blockchain-Based Crowdsourcing Platform
+- https://dx.doi.org/10.1109/TEM.2019.2920154
 
 ## Other
 - https://docs.docker.com/config/containers/container-networking/
diff --git a/content/notes/think-writing.md b/content/notes/think-writing.md
index 6fdc581b7..19b3fdfd2 100644
--- a/content/notes/think-writing.md
+++ b/content/notes/think-writing.md
@@ -156,4 +156,6 @@ doi: 10.1109/TEM.2020.3003565: Permissionless and Permissioned, Technology-Focus
 - soft vs hard fork
 	- soft: different states of the same blochain that coexist and are eventually reconnected
 	- hard: a complete separate copy of a blockchain
+- How will the blockchain be funded? Maybe I need to consider this.
+- Blockchain as a service?