TY - JOUR AU - Nakazato, Hiroshi AU - Bebiano, Natalia AU - Da Providencia, Joao TI - The numerical range of linear operators on the 2-dimensional Kreĭn space JO - The electronic journal of linear algebra PY - 2011 SP - 430 EP - 442 VL - 22 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/ELA_2011__22__a52/ LA - en ID - ELA_2011__22__a52 ER -