@article{NUMA_1989__54_3_133309,
     author = {Klaus Menke},
     title = {Point {Systems} with {Extremal} {Properties} and {Conformal} {Mapping.}},
     journal = {Numerische Mathematik},
     pages = {125--144},
     publisher = {mathdoc},
     volume = {54},
     number = {3},
     year = {1989},
     zbl = {0655.30006},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1989__54_3_133309/}
}