91 Essays on Infinite Lifespans   Robert A. Freitas Jr. 16) Freitas Jr., Robert A; “Section 15.4.2.3 Geometrical Trapping in Spleen Vasculature,” in: Nanomedicine, Volume IIA: Biocompatibility, Landes Bioscience, (2003); pg. 95–97 http://www.nanomedicine.com/NMIIA/15.4.2.3.htm#p6 17) Drexler, Eric K; “Section 13.4.1 A bounded-continuum design for a stiff manipulator,” in: Nanosystems: Molecular Machinery, Manufacturing, and Computation (1992) edited by John Wiley & Sons; pg. 398–407 18) Freitas Jr., Robert A; “Chromallocytes: Cell Repair Nanorobots for Chromosome Replacement Therapy,” (2004); in preparation. 19)  Robert A. Freitas Jr., “Section 1.2.2. Volitional Normative Model of Disease,” in:  Nanomedicine, Volume I: Basic Capabilities, Landes Bioscience (1999), pg. 18–20;   http://www.nanomedicine.com/NMI/1.2.2.htm 20) Freitas Jr., Robert A & Phoenix, Christopher J &   “Vasculoid: A personal nanomedical appliance to replace human blood,” in: Journal of Evolution and Technology 11 (2002); http://www.jetpress.org/volume11/vasculoid.html