@article{articlee58bcded,
title   = {'épsilon'-subgradient algorithms for bilevel convex optimization},
author = {Helou, Elias Salomão and Simões, Lucas E. A},
year = {2017},
doi = {10.1088/1361-6420/aa6136},
journal   = {Inverse Problems : An International Journal of Inverse Problems, Inverse Methods and Computerised Inversion of Data}
}