HeadingKirkman, Thomas Penyngton used in: Integrated Authority File (GND), Germany
Retrat de Thomas Pennyngton Kirkman (1806-1895), matemàtic britànic. [Unknown authorUnknown author / MacTutor History of Mathematics: http://www-history.mcs.st-andrews.ac.uk/PictDisplay/Kirkman.html -- Public domain -- http://commons.wikimedia.org/wiki/File:Thomas P Kirkman.jpg]