1. People challenges in biospheric systems for long-term habitation in remote areas, space stations, Moon and Mars expeditions;Allen;Life Support and Biosphere Science,2002
2. Artificial biospheres as a model for global ecology on planet Earth;Allen;Life Support and Biosphere Science,2001
3. The design approach for Mars on Earth™, a biospheric closed system testing facility for long-term space habitation, IAF/AIAA conference, Houston 2002;Allen;Adv. Space Res.,2002
4. Biospherics and Biosphere 2, Mission One (1991–1993);Allen;Ecological Engineering,1999
5. Biospheric Theory and Report on Overall Biosphere 2, Design and Performance During Mission One (1991–1993);Allen;Life Support and Biosphere Science,1997