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https://doi.org/10.1016/j.geomphys.2016.11.027 (Publisher version)
Meshkov, A. G., & Sokolov, V. V. (2017). On third order integrable vector Hamiltonian equations. Journal of Geometry and Physics, 113, 206-214. doi:10.1016/j.geomphys.2016.11.027.