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so where is the paper ?

That paper is from 2018, so I don't think it's the new one the article talks about

Thanks but that is their past paper and not the latest one as I understand

It is that paper. It isn't properly published yet, and is still under review.

"set to be published in a forthcoming Journal of Finance," according to Yahoo! finance: https://finance.yahoo.com/news/single-whale-bitfinex-likely-...