The standard way to find an old undigitalized preprint is to ask the author. In this case this way unfortunately is not available:

https://www.math.ku.dk/english/about/news/foxby/

But the author had several Ph.D. students:

https://www.genealogy.math.ndsu.nodak.edu/id.php?id=43934

so there is a chance that some of them know how one can find this preprint,

or, maybe, whether the preprint in question was published later under modified title.

Thanks for giving me indications!