@article{ARM_2005__41_4_a7,
     author = {Impram, Serkan T. and Johnson, Russell and Pavani, Raffaella},
     title = {The $D$-stability problem for $4\times 4$ real matrices},
     journal = {Archivum mathematicum},
     pages = {439--450},
     publisher = {mathdoc},
     volume = {41},
     number = {4},
     year = {2005},
     mrnumber = {2195496},
     zbl = {1122.15003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ARM_2005__41_4_a7/}
}