Stanislav Angelov Boulos Harb Sampath Kannan Li-San Wang Weighted isotonic regression under the <i>L</i><sub>1</sub> norm. 783-791 2006 conf/soda/2006 SODA http://dl.acm.org/citation.cfm?id=1109557.1109643 db/conf/soda/soda2006.html#AngelovHKW06