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CS1 error on Poisson distribution

Hello, I'm Qwerfjkl (bot). I have automatically detected that this edit performed by you, on the page Poisson distribution, may have introduced referencing errors. They are as follows:

• A "missing title" error. References show this error when they do not have a title. Please edit the article to add the appropriate title parameter to the reference. (Fix | Ask for help)

Please check this page and fix the errors highlighted. If you think this is a false positive, you can report it to my operator. Thanks, Qwerfjkl (bot) (talk) 15:54, 3 August 2023 (UTC)