@article{NUMA_1992__62_1_133644,
     author = {Marc Van Barel and Adhemar Bultheel},
     title = {A new formal approach to the rational interpolation problem.},
     journal = {Numerische Mathematik},
     pages = {87--122},
     year = {1992},
     volume = {62},
     number = {1},
     zbl = {0765.65016},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1992__62_1_133644/}
}