Shiibashi, Akio: 'Railway ticketing services (Suica)' (Transportation, 2018), 'Autonomous Decentralized Systems and their Applications in Transport and Infrastructure', Chap. 7, pp. 159-179, DOI: 10.1049/PBTR009E_ch7
IET Digital Library, https://digital-library.theiet.org/;jsessionid=28jrp9566xmrc.x-iet-live-01content/books/10.1049/pbtr009e_ch7