@article{AM2_1979__19_136813,
     author = {Guido Claessens},
     title = {Bigradients, {Hankel} determinants and the {Newton-Pad\'e} table.},
     journal = {Aequationes mathematicae},
     pages = {104--112},
     publisher = {mathdoc},
     volume = {19},
     year = {1979},
     zbl = {0418.41009},
     url = {http://geodesic.mathdoc.fr/item/AM2_1979__19_136813/}
}