[[1]. K.J.BATHE, E.L.WILSON: “Numerical methods in finite element analysis”, New York: Prentice Hall, Englewwod Cliffs, 1976.]Search in Google Scholar
[[2]. E.L.WILSON: “Three-dimensional static and dynamic analysis of structures”, Berkeley: Computers and Structures Inc., 2002.]Search in Google Scholar
[[3]. J.S.PRZEMIENECKI: “Theory of matrix structural analysis”, New York: Mc Graw- Hill, 1968.]Search in Google Scholar
[[4]. G.ONU: “Calculation of pile caps”, Studies and research of aplied mechanics, Extras, nr.4, Tomul 33, Editura Academiei, 1974.]Search in Google Scholar