@article{10_4153_CMB_1967_041_8,
     author = {Cockayne, E. J.},
     title = {On the {Steiner} {Problem}},
     journal = {Canadian mathematical bulletin},
     pages = {431--450},
     year = {1967},
     volume = {10},
     number = {3},
     doi = {10.4153/CMB-1967-041-8},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1967-041-8/}
}