@article{RM_1987_42_4_a0,
     author = {A. V. Mikhailov and A. B. Shabat and R. I. Yamilov},
     title = {The~symmetry approach to the classification of non-linear equations. {Complete} lists of integrable systems},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {1--63},
     publisher = {mathdoc},
     volume = {42},
     number = {4},
     year = {1987},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1987_42_4_a0/}
}