I participated in an AI competition and as a part of my submission, I submitted a paper about my solution. This paper was part of a conference (held alongside the main conference), and the competition organisers also published a book (subseries of a book series) which had the paper as a chapter. On ACM digital library, the bibtex includes the conference details for publication and the springer site (book series publisher), the bibtex has the book as the publication. Both have the same DOI.
How should I mention this paper in my resume or CV? I am also applying for graduate programs, should I mention it twice, once under conference workshops and once under publications or just under publications?