Wardman M, Chintakayala PK, de Jong G. Values of travel time in Europe: review and meta-analysis. Transp Res Part A Policy Pract. 2016 Dec;94:93-111. doi: 10.1016/j.tra.2016.08.019
Brogan AJ, Stidham S. A note on separation in mean-lower-partial-moment portfolio optimization with fixed and moving targets. IIE Trans. 2005 Jan 1;37(10):901-6.