Optimal inequalities characterising quasi-umbilical submanifolds. Decu, Simona; Haesen, Stefan; Verstraelen, Leopold — 2008 JIPAM. Journal of Inequalities in Pure & Applied Mathematics [electronic only]
On the Chen character of δ ( 2 ) –ideal submanifolds Simona Decu; Bilkis Jahanara; Miroslava Petrović-Torgašev; Leopold Verstraelen — 2009 Kragujevac Journal of Mathematics
Ricci and Casorati principal directions of δ ( 2 ) Chen ideal submanifolds Simona Decu; Anica Pantić; Miroslava Petrović-Torgašev; Leopold Verstraelen — 2013 Kragujevac Journal of Mathematics