Kinderlehre, David
An introduction to variational inequalities and their applications
Academic Press, 1980
 Buku Referensi
Friedman, Avner
Variational principles and free-boundary problems
John Wiley & Sons, 1982
 Buku Teks
Oden, J. Tinsley (John Tinsley), 1936-
An introduction to the mathematical theory of finite elements
John Wiley & Sons, 1976
 Buku Teks
Kikuchi, Noboru
Contact problems in elasticity: a study of variational inequalities and finite element methods
Society for Industrial and Applied Mathematics, 1988
 eBooks
Ito, Kazufumi
Lagrange multiplier approach to variational problems and applications
Society for Industrial and Applied Mathematics, 2008
 eBooks