Full Reference
0xcert. “ERC-721 Hitting a Home Run”. Medium. May 31, 2018. Accessed before May 2020. https://medium.com/0xcert/erc-721-hitting-a-home-run-77d6b4fca33d?source=read_next_metabar
0xcert. “ERC-721 Hitting a Home Run”. Medium. May 31, 2018. Accessed before May 2020. https://medium.com/0xcert/erc-721-hitting-a-home-run-77d6b4fca33d?source=read_next_metabar