Yano, M., Dai, C., Masuda, K., & Kishimoto, Y. (2020). Blockchain and Crypto Currency: Building a High Quality Marketplace for Crypt Data (p. 141). Springer Nature.
 How to DeFi 1st Edition, March 2020, Lau et al.
 Nakamoto, S. (2011). Bitcoin: A Peer-to-Peer Electronic Cash System.
 Patel, H. (2014). A block chain based decentralized exchange. International Association for Cryptologic Research, XP061017563, 20141225, 065012