@article{02116372,
title = {Optimality conditions and Toland's duality for a nonconvex minimization problem.},
journal = {Matematichki Vesnik},
volume = {55},
year = {2003},
pages = {21-30},
zbl = {1051.49020},
language = {en},
url = {http://dml.mathdoc.fr/item/02116372}
}
Laghdir, M. Optimality conditions and Toland's duality for a nonconvex minimization problem.. Matematichki Vesnik, Tome 55 (2003) pp. 21-30. http://gdmltest.u-ga.fr/item/02116372/