@article{ELA_1997__2__a0,
     author = {Berman, Abraham and Krupnik, Mark},
     title = {Spectrum preserving lower triangular completions -- the nonnegative nilpotent case},
     journal = {The electronic journal of linear algebra},
     pages = {9--16},
     publisher = {mathdoc},
     volume = {2},
     year = {1997},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ELA_1997__2__a0/}
}