Yuri Rabinovich Ran Raz Lower Bounds on the Distortion of Embedding Finite Metric Spaces in Graphs. 79-94 1998 19 Discrete & Computational Geometry 1 http://link.springer.de/link/service/journals/00454/bibs/19n1p79.html db/journals/dcg/dcg19.html#RabinovichR98