My question is inverse of the following question:
How can you find the DOI of an article that doesn't seem to have one?
I am looking for the ISBN number (it's a requirement for getting permissions on copyright.com) for the following paper:
I found its DOI to be
doi:10.2514/6.2000-519 from the citation data, however I couldn't find the ISBN. Is this typical? In the sense that can there be a DOI but not an ISBN for a manuscript?