Time-dependent internal forces in uncracked structures: analysis by the force method - Concrete Structures: Stresses and Deformations - page 145

3 See Section 5.11 of the reference mentioned in note 3 of Chapter 3.
4 A simple method for the evaluation of integrals for the calculation of displacements
by virtual work can be found in Section 6.4 of the reference mentioned in note 3 of
Chapter 3.
5 Terzaghi, K. and Peck, R.B. (1966), Soil Mechanics in Engineering Practice , Wiley,
New York, page 240.