@article{NUMA_1991__60_4_133601,
     author = {J.C. Butcher and R.P.K. Chan},
     title = {On symmetrizers for {Gauss} methods.},
     journal = {Numerische Mathematik},
     pages = {465--476},
     publisher = {mathdoc},
     volume = {60},
     number = {4},
     year = {1991},
     zbl = {0723.65045},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1991__60_4_133601/}
}