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qL7. Tony Eng and Tatsuaki Okamoto, Single-Term Divisible Electronic Coins, Advances in Cryptology EUROCRYPT '94, Springer-Verlag, pp. 311-323.
https://whatsonchain.com/tx/06a5ca9d3d28bd4c32b2c84f50c2a6be4c1243bb9918c97e7dec4e122edfc6cf