1. Justin H. Smalley ,"STRESSES AND CONFIGURATIONS OF NATURAL-SHAPED BALLOONS0022, 1963. Justin H. Smalley, "BALLGON SHAPES AND STRESSES BELOW THE DESIGN ALTITUDE0022, 1966 J.B. Munson, "PRELIMINARY DESIGN REPORT FOR THE LONG DURATION PLATFORM VEHICLE0022, Sheldahl, Advanced Product Division, May 1975. J.B. Munson, "FINAL DESIGN REPORT FOR THE LONG DURATION PLATFORM VEHICLE0022, Sheldahl, Advanced Product Division, August 1977. 5. Justin H. Smalley "Development of the e-Balloon0022, National Center for Atmospheric Research, Boulder Colorado, June 1970.