<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Well, I’m using here a rather old Macbook with TeXShop Version 4.44. I simply type <font face="Menlo" class=""><span style="font-size: 12px;" class="">"Acta Mathematica” </span></font><div class="">with the double quotation mark (above the number 2 on my German keyboard), and it comes out correctly. See the minimal example:</div><div class=""><br class=""></div><div class=""></div></body></html>