Alexandr Andoni Piotr Indyk Robert Krauthgamer Overcoming the <i>l</i><sub>1</sub> non-embeddability barrier: algorithms for product metrics. 865-874 2009 SODA http://doi.acm.org/10.1145/1496770.1496864 conf/soda/2009 db/conf/soda/soda2009.html#AndoniIK09