@article{NUMA_1982__39_132781,
     author = {M.von Golitschek},
     title = {Optimal {Cycles} in {Doubly} {Weighted} {Graphs} and {Approximation} of {Bivariate} {Functions} by {Univariate} {Ones.}},
     journal = {Numerische Mathematik},
     pages = {65--84},
     publisher = {mathdoc},
     volume = {39},
     year = {1982},
     zbl = {0541.65009},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1982__39_132781/}
}