Kragh, H. (2007).
Kosmologi. I
Leksikon for det 21. Århundrede: (Internet-leksikon) www.leksikon.org.
Madsen, I. (2007).
Moduli Spaces from a Topological Viewpoint. I M. Sanz-Solé, J. Soria, J. L. Varona & J. Verdera (red.),
Proceedings of the International Congress of Mathematicians: Plenary lectures and ceremonies (s. 385-411). European Mathematical Society.