1. JULIAN, O.G., J. Struct. Div., ASCE, 83(ST4) Proc. Paper 1316, Jul. 1957.
2. FREUDENTHAL, A.M., GARRELTS, J.M., and SHINOZUKA, M., J. Struct. Div. ASCE 92, (ST1), Proc. Paper 4682, Feb. 1966.
3. TURKSTRA, C.J., J. Struct. Div. ASCE, 93, (ST6), Proc. Paper 5678, Dec. 1967.
4. EGGWERTZ, S., and LINDSJO, G., F.A.A. Rept. HU-961, Roy. Aero. Res. Inst. Sweden, Stockholm, 1963.
5. FREUDENTHAL, A.M., W.A.D.D. Technical Rept., 61–53, 1961.