https://www.rbth.com/science-and-tech/332228-forgotten-weapons-russian-pistol-gurza
https://weaponsystems.net/system/177-HH01%20-%209x21mm%20Russian
http://ballistics101.com/9mm.php
https://weaponsystems.net/system/1267-QSZ92
https://zh.wikipedia.org/wiki/5.8%C3%9721mm
https://www.usacarry.com/how-powerful-is-5-7x28mm/
https://www.shootingtimes.com/editorial/the-british-webley-double-action-revolver/358260
https://sites.google.com/site/britmilammo/9mm-parabellum/9mm-parabellum-ball
https://en.wikipedia.org/wiki/FN_Five-seven#NATO_evaluation
https://books.google.com/books?id=hs9BAAAAIAAJ&pg=PA16#v=onepage&q&f=false