Brubaker L, Richter HE, Barber MD, Hsu Y, Rahn DD, Menefee S, Visco A, Spino C, Martin S, Meikle SF. Pelvic floor disorders clinical trials: participant recruitment and retention. Int Urogynecol J. 2013 Jan 1;24(1):73-9.
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.