User talk:128.196.204.82

March 2022
Hello, I'm DVdm. I noticed that you added or changed content in an article, Invariant mass, but you didn't provide a reliable source. It's been removed and archived in the page history for now, but if you'd like to include a citation and re-add it, please do so. You can have a look at referencing for beginners. If you think I made a mistake, you can leave me a message on my talk page. Same remark for your edit to Mass–energy equivalence‎ and  Mass in special relativity‎. See wp:UNDUE, wp:primary source, and likely wp:COI- DVdm (talk) 20:54, 23 March 2022 (UTC)