The link says https://tug.org/TUGboat/tb08-1/tb17knutmix.pdf https://tug.org/TUGboat/tb08-1/tb17knutmix.pdf ¹ There is no space between pdf and ¹, so the HN s

The link says https://tug.org/TUGboat/tb08-1/tb17knutmix.pdf https://tug.org/TUGboat/tb08-1/tb17knutmix.pdf ¹ There is no space between pdf and ¹, so the HN server assumes incorrectly that the ¹ is part of the link.