@article{article9c3060e1,
title   = {Quasi-integrability of deformations of the KdV equation},
author = {Braak, F. ter and Ferreira, Luiz Agostinho and Zakrzewski, W. J.},
year = {2019},
doi = {10.1016/j.nuclphysb.2018.12.004},
journal   = {Nuclear Physics B}
}