References: Solid Mechanics

Huebner, Kenneth H.

Martin, Harold C. and Graham F. Carey

Gallagher, Richard H.

Malvern, Lawrence E.

Dym, Clive L., Irving H. Shames

Shames, Irving H.

Turner, M. J., R. W. Clough, H. C. Martin, and L. J. Topp
"Stiffness and Deflection Analysis of Complex Structures," Journal Aeronautical Science, Vol. 23, pp. 805-824 , 1956.