@article{DCG_1991__6_4_131167,
     author = {H. Edelsbrunner and E. Welzl and P.K. Agarwal and O. Schwarzkopf},
     title = {Euclidean {Minimum} {Spanning} {Trees} and {Bichromatic} {Closest} {Pairs.}},
     journal = {Discrete & computational geometry},
     pages = {407--422},
     publisher = {mathdoc},
     volume = {6},
     number = {4},
     year = {1991},
     zbl = {0753.68089},
     url = {http://geodesic.mathdoc.fr/item/DCG_1991__6_4_131167/}
}