@article{NUMA_1968__12_131875,
     author = {A.R.G. HEESTERMAN},
     title = {Special {Simplex} {Algorithm} for {Multi-Sector} {Problems.}},
     journal = {Numerische Mathematik},
     pages = {288--306},
     publisher = {mathdoc},
     volume = {12},
     year = {1968},
     zbl = {0174.47905},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1968__12_131875/}
}