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+* [A Peer-to-Peer Electronic Cash System] (https://bitcoin.org/bitcoin.pdf)
+  < This paper was the introduction to bitcoin as applicaton of the blockchain technology.
+* [Hyperledger Fabric: A Distributed Operating System for Permissioned Blockchains](https://arxiv.org/pdf/1801.10228)
+  < This paper was the introduction to private blockchain based on open source framework Hyperledger Fabric.