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MR1806523 (2001h:90011) Üster, Halit; Love, Robert F. On the directional bias of the $\scr l\sb {bp}$-norm. European J. Oper. Res. 128 (2001), no. 3, 664--673. (Reviewer: Sandra L. Arlinghaus) 90B06 (90B10 91D20)