@article{ZNSL_2002_284_a0,
     author = {Yu. A. Alpin and S. N. Il'in},
     title = {Powers of sign portraits of real matrices},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {5--17},
     publisher = {mathdoc},
     volume = {284},
     year = {2002},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2002_284_a0/}
}