TY - JOUR AU - Berman, Abraham AU - Krupnik, Mark TI - Spectrum preserving lower triangular completions -- the nonnegative nilpotent case JO - The electronic journal of linear algebra PY - 1997 SP - 9 EP - 16 VL - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/ELA_1997__2__a0/ LA - en ID - ELA_1997__2__a0 ER -