@article{NUMA_1991__59_8_133571,
     author = {Joseph Hersch and William Sawyer},
     title = {Numerical implementation of coherence for the example of the },
     journal = {Numerische Mathematik},
     pages = {659--666},
     publisher = {mathdoc},
     volume = {59},
     number = {8},
     year = {1991},
     zbl = {0743.65085},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1991__59_8_133571/}
}