- en.defence-ua.com industries/what_is_special_…And most importantly, the PT-91 Twardy is equipped with the domestic active armor protection ERAWA.
- unian.net war/pt-91-twardy-chto-eto-za-polskiy-…
- mil.in.ua en/news/117th-mechanized-brigade-armed-…The Armed Forces of Ukraine equipped the newly formed brigade with Polish PT-91 tanks in 2023. Twardy tanks were received by the 117th Mechanized Brigade...
- kyivindependent.com presidents-office-poland-to-…Poland will deliver 60 modernised tanks to Ukraine in the near future, including locally-made PT-91 Twardy models...
- gagadget.com en/war/150329-ukraine-received-…Experiments have shown that the protection of PT-91 Twardy has increased by 30-70%.
- novayagazeta.eu articles/2023/01/27/polsha-…
- 24tv.ua ru/polsha-peredaet-ukraine-tanki-pt-91-…
- zikipedia.herokuapp.com wiki/PT-91_TwardyPT-91 Twardy Polonya yapımı ana muharabe tankıdır.
- everything.explained.today PT-91_Twardy/PT-91 Twardy. Production variant for the Polish Army, an extensively modernized development of the T-72M1.