@article{NUMA_1978__31_132587,
     author = {A.S.L. Shieh},
     title = {Fast {Poisson} {Solvers} on {General} {Two} {Dimensional} {Regions} for the {Dirichlet} {Problem.}},
     journal = {Numerische Mathematik},
     pages = {405--430},
     publisher = {mathdoc},
     volume = {31},
     year = {1978},
     zbl = {0431.65064},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1978__31_132587/}
}