Action infinity theory by Zero 6th revised edition （Action infinity arises by dividing by 0）English version, Japanese version, 49.9 US dollars per book
動作無限理論 6回目の改訂版（0で割って生じる動作無限）伊藤 心也 著
Theory book, ISBN978-4-910283-13-5 (English version), ISBN978-4-910283-12-8 (Japanese version)
By Shinya Ito
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- English version (Paper media)
- Japanese version (Paper media)