City, University of London Institutional Repository Citation: Fatouros, S., Karcanias, N., Christou, D. and Papadopoulos, P. (2013). Approximate greatest common divisor of many polynomials and pseudo-spectrum. System, Structure and Control, 5(1), pp. 623-628. doi: 10.3182/20130204-3-FR-2033.00113 This is the accepted version of the paper. This version of the publication may differ from the final published version. Permanent repository link: https://openaccess.city.ac.uk/id/eprint/7282/ Link to published version: http://dx.doi.org/10.3182/20130204-3-FR-2033.00113 Copyright: City Research Online aims to make research outputs of City, University of London available to a wider audience. Copyright and Moral Rights remain with the author(s) and/or copyright holders. URLs from City Research Online may be freely distributed and linked to. Reuse: Copies of full items can be used for personal research or study, educational, or not-for-profit purposes without prior permission or charge. Provided that the authors, title and full bibliographic details are credited, a hyperlink and/or URL is given for the original metadata page and the content is not changed in any way. City Research Online: http://openaccess.city.ac.uk/ publications@city.ac.uk City Research Online