Stability of delocalized nonlinear vibrational modes in graphene latticeDina U. Abdullina, Maria N. Semenova, Aleksander S. Semenov, Elena A. Korznikova and Sergey V. DmitrievEur. Phys. J. B, 92 11 (2019) 249DOI: https://doi.org/10.1140/epjb/e2019-100436-y