Towards classification of -dimensional integrable equations. Integrability conditions (after the paper by A.V. Mikhailov and R.I. Yamilov by the same title, doi:10.1088/0305-4470/31/31/015, Ravil Yamilov's copy)
On linear degeneracy of integrable quasilinear systems in higher dimensions (after the paper by E.V. Ferapontov, K.R. Khusnutdinova, and C. Klein by the same title, arXiv:0909.5685)