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He didn't publish any papers that I'm aware of, and he wasn't associated with an institution. I'm hoping to write a short biography at some time.

Looking through the code I see a lot of references to a group of japanese researchers. See for example this file which references "A.KUDO & Y.KIDA" and is complete with japanese comments. https://github.com/daoudclarke/wartonlegacy/blob/master/src/...

Looks like K.Aoki (Kazumaro Aoki) A.KUDO & Y.KIDA used to post to academic factorization related mailing lists see: http://www.loria.fr/~zimmerma/records/6353

Kida wrote UBASIC I believe.