Link: https://1pdf.net/download/how-the-bitcoin-protocol-actually-works_586ea4d1e12e89a25f167d00
Link: https://1pdf.net/download/digitalbtc-brings-bitcoin-to-the-asx_58754672e12e891f5ecc5545
Link: https://1pdf.net/download/bitcoin-ng-a-scalable-blockchain-protocol-usenix_59ce0388f6065dd26e4c6d38
Link: https://1pdf.net/download/the-ultimate-guide-to-bitcoin-pearsoncmgcom_58d64ba8f6065d4f34f9549d
Link: https://1pdf.net/download/silk-road-and-bitcoin-swansea-university_591306ebf6065d16624a6386
Link: https://1pdf.net/download/bitcoin-bubble-or-blockchain-springer-link_5a255b18f6065d5f2219e182