User talk:Dr-er
References
[edit]Hello Dr-er. You have added some new formulas for the area of a quadrilateral. However you must also provide reliable references, otherwise your edits might be removed. Best regards Circlesareround (talk) 18:40, 17 December 2014 (UTC)
Red links
[edit]You added many red links to Zelimkhan Khangoshvili page. Even GRU and FSB links do not point to their pages. Please fix them. If there is no english article, you could link to German ones. Smeagol 17 (talk) 17:55, 5 October 2020 (UTC)
I have no time for this right now but will try to fix the problems as soon as possible. Dr-er (talk) 20:52, 31 May 2021 (UTC)