@article{NUMA_1986__48_133065,
     author = {J.N. Lyness and Bruno Gabutti},
     title = {Some {Generalizations} of the {Euler-Knopp} {Transformation.}},
     journal = {Numerische Mathematik},
     pages = {199--220},
     publisher = {mathdoc},
     volume = {48},
     year = {1986},
     zbl = {0588.65001},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1986__48_133065/}
}