ISBN 978-1-4419-2026-3. Radu Ioan Boţ; Gert Wanka; Sorin-Mihai Grad. Duality in Vector Optimization. Springer. 2009. ISBN 978-3-642-02885-4. Ernö Robert Csetnek
Sorin-Mihai Grad. Duality in Vector Optimization. Springer. 2009. ISBN 978-3-642-02885-4. J. P. Ponstein. Approaches to the Theory of Optimization. Cambridge
Nonlinear Optimization: Theory and Examples 2. Springer. 2006: 76–77. ISBN 978-0-387-29570-1. Boţ, Radu Ioan; Wanka, Gert; Grad, Sorin-Mihai. Duality in Vector