The mean curvature of the second fundamental form of a hypersurface. Haesen, Stefan; Verpoort, Steven — 2010 Beiträge zur Algebra und Geometrie
Natural intrinsic geometrical symmetries. Haesen, Stefan; Verstraelen, Leopold — 2009 SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only]
Optimal inequalities characterising quasi-umbilical submanifolds. Decu, Simona; Haesen, Stefan; Verstraelen, Leopold — 2008 JIPAM. Journal of Inequalities in Pure & Applied Mathematics [electronic only]
Universal natural shapes Johan Gielis; Stefan Haesen; Leopold Verstraelen — 2005 Kragujevac Journal of Mathematics
On Growth and Form and Geometry. I Stefan Haesen; Ana Irina Nistor; Leopold Verstraelen — 2012 Kragujevac Journal of Mathematics
Submanifold theory and parallel transport Franki Dillen; Johan Fastenakels; Stefan Haesen; Joeri Van der Veken; Leopold Verstraelen — 2013 Kragujevac Journal of Mathematics