1. Leadership and America's Future in Space;Ride;A Report to the NASA Administrator,1987
2. Distribution of Human Waste Samples in Relation to Sizing Waste Processing in Space;Parker,1988
3. Composition and Analysis of a Model Waste for a CELSS;Wydeven;NASA Technical Memorandum 84368,1983
4. Composition and Concentrative Properties of Human Urine;Putnam,1970
5. Advanced Regenerative Environmental Control and Life Support Systems: Air and Water Regeneration;Schubert;Adv. Space Res.,1984