PIETER BRUYNINCKX ET AL: 'Segmentation of lung vessel trees by global optimization', PROCEEDINGS VOLUME 9025IS&T/SPIE ELECTRONIC IMAGING | 2-6 FEBRUARY 2014INTELLIGENT ROBOTS AND COMPUTER VISION XXXI: ALGORITHMS AND TECHNIQUES, vol. 7259, 26 February 2009 (2009-02-26), US, pages 725912, XP055407358, ISSN: 0277-786X, ISBN: 978-1-5106-1354-6, DOI: 10.1117/12.811570