Sublinear Approximation of Euclidean Minimum Spanning Tree
A. Magen, F. Ergun, C. Sohler, R. Rubinfeld, A. Czumaj, I. Newman, L. Fortnow, in: Proceedings of the 14th ACM-SIAM Symposium on Discrete Algorithms (SODA 2003), 2003, pp. 813–822.