Multi-author papers may be included within a thesis; however, you are expected to be the primary author of these papers.
A clear statement is required for each publication documenting the contribution of each author to the paper (from conceptualisation to realisation and documentation). If you are not the first author, you need to justify the paper’s inclusion and clearly explain the circumstances relating to the production of the paper and your position in the list of authors. It may be more suitable to include these papers as appendices, rather than in the main body of the thesis.
If you include a paper which has multiple authors you are required to obtain permission from the co-authors to include their work in your thesis. Co-authors can give their permission via the Co-authorship approval form.