@article{ELA_2010__20__a6,
     author = {Elhashash, Abed and Szyld, Daniel B.},
     title = {Matrix functions preserving sets of generalized nonnegative matrices},
     journal = {The electronic journal of linear algebra},
     pages = {673--690},
     publisher = {mathdoc},
     volume = {20},
     year = {2010},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ELA_2010__20__a6/}
}