1. Morris, A. L.(ed.), "Scientific Ballooning Handbook," NCAR Tech.Note, NCAR TN-99,National Center for Atmospheric Research, Boulder, CO,1975, Sec. V, pp.1-45.
2. 2Anon. "Research Development in the Field of High Altitude Plastic Balloons," Univ. of Minnesota, Dept. of Physics, Minneapolis, MN, 1951-1956, NONR-710(01) Reports, pp.3-12.