Gilles Savard, Jacques Gauvin. The steepest descent direction for the nonlinear bilevel programming problem. Oper. Res. Lett., 15(5):265-272, 1994. [doi]
@article{SavardG94,
title = {The steepest descent direction for the nonlinear bilevel programming problem},
author = {Gilles Savard and Jacques Gauvin},
year = {1994},
doi = {10.1016/0167-6377(94)90086-8},
url = {http://dx.doi.org/10.1016/0167-6377(94)90086-8},
researchr = {https://researchr.org/publication/SavardG94},
cites = {0},
citedby = {0},
journal = {Oper. Res. Lett.},
volume = {15},
number = {5},
pages = {265-272},
}