W. Kropatsch, Y. Haxhimusa, P. Lienhardt:
"13. Hiearchies relating Topology and Geometry";
in: "Cognitive Vision Systems: Sampling the Spectrum of Approaches", issued by: Springer; Springer LNCS, Berlin - Heidelberg - New York, 2006, ISBN: 978-3-540-33971-7, 199 - 220.