Jerzy Kaliszewski

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This article may be expanded with text translated from the corresponding article in Polish. (October 2017) Click [show] for important translation instructions.

Machine translation like DeepL or Google Translate is a useful starting point for translations, but translators must revise errors as necessary and confirm that the translation is accurate, rather than simply copy-pasting machine-translated text into the English Wikipedia.
Do not translate text that appears unreliable or low-quality. If possible, verify the text with references provided in the foreign-language article.
You must provide copyright attribution in the edit summary accompanying your translation by providing an interlanguage link to the source of your translation. A model attribution edit summary is Content in this edit is translated from the existing Polish Wikipedia article at [[:pl:Exact name of the article]]; see its history for attribution.
You should also add the template {{Translated page}} to the talk page.
For more guidance, see Wikipedia:Translation.