https://blog.wongcw.com/2019/03/08/%e8%b0%b7%e6%ad%8c%e5%a1%97%e9%b4%89%e9%80%b1%e5%9b%9b%e7%b4%80%e5%bf%b5%e4%bf%84%e7%be%85%e6%96%af%e6%95%b8%e5%ad%b8%e5%ae%b6olga-ladyzhenskaya97%e6%ad%b2%e8%aa%95%e8%be%b0/
谷歌塗鴉週四紀念俄羅斯數學家Olga Ladyzhenskaya97歲誕辰