RFC 3986 (STD 66) recommends (in appendix C) delimiting URLs in angle brackets to avoid the problem which your link now has. I.e. if you’d written <https://tug

RFC 3986 (STD 66) recommends (in appendix C) delimiting URLs in angle brackets to avoid the problem which your link now has. I.e. if you’d written <https://tug.org/TUGboat/tb08-1/tb17knutmix.pdf https://tug.org/TUGboat/tb08-1/tb17knutmix.pdf>¹ there would have been no problem.