TY - JOUR AU - Piotr Mormul TI - Singularity Classes of Special 2-Flags JO - Symmetry, integrability and geometry: methods and applications PY - 2009 VL - 5 UR - http://geodesic.mathdoc.fr/item/SIGMA_2009_5_a101/ LA - en ID - SIGMA_2009_5_a101 ER -