− | [https://www.bbc.com/future/article/20230712-how-ancient-skywells-are-keeping-chinese-homes-cool Skywells] | + | Skywells [https://www.bbc.com/future/article/20230712-how-ancient-skywells-are-keeping-chinese-homes-cool 1] [https://www.hindawi.com/journals/ace/2021/6666701/ 2] |