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https://token.kitchen/token-economy/references-te3vol2ch1

Flynn, Brian. “Designing Non-Fungible Tokens as Open Ecosystems Airdrops: Interoperability & Extensibility, and Royalties”. Medium. Aug 07, 2018. Accessed before May 2020. https://tokeneconomy.co/designing-non-fungible-tokens-as-open-ecosystems-a0f28ae213ee