L. Brun, W. Kropatsch:
"Inside and Outside within Combinatorial Pyramids";
in: "5th IAPR-TC15 Workshop on Graph-based Representation in Pattern Recognition", L. Brun, M. vento (ed.); issued by: IAPR; Springer, LNCS, Berlin, Heidelberg, New York, 2005, 122 - 131.