@article{NUMA_1991__60_4_133587,
     author = {Volker Mehrmann and Peter Kunke},
     title = {Smooth factorizations of matrix valued functions and their derivatives.},
     journal = {Numerische Mathematik},
     pages = {115--132},
     publisher = {mathdoc},
     volume = {60},
     number = {4},
     year = {1991},
     zbl = {0753.65033},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1991__60_4_133587/}
}