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
Kikuchi, Noboru
Contact problems in elasticity: a study of variational inequalities and finite element methods
Society for Industrial and Applied Mathematics, 1988
 eBooks
Oden, J. Tinsley (John Tinsley), 1936-
An introduction to the mathematical theory of finite elements
John Wiley & Sons, 1976
 Buku Teks
Ito, Kazufumi
Lagrange multiplier approach to variational problems and applications
Society for Industrial and Applied Mathematics, 2008
 eBooks