@article{DCG_1993__10_2_131265,
     author = {N. Alon and Y. Azar},
     title = {On-Line {Steiner} {Trees} in the {Euclidean} {Plane.}},
     journal = {Discrete & computational geometry},
     pages = {113--122},
     publisher = {mathdoc},
     volume = {10},
     number = {2},
     year = {1993},
     zbl = {0774.68088},
     url = {http://geodesic.mathdoc.fr/item/DCG_1993__10_2_131265/}
}