@article{ELA_2003__10__a5,
     author = {Groenewald, Gilbert J. and Petersen, Mark A.},
     title = {$J$-spectral factorization for rational matrix functions with alternative realization},
     journal = {The electronic journal of linear algebra},
     pages = {240--256},
     publisher = {mathdoc},
     volume = {10},
     year = {2003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ELA_2003__10__a5/}
}