R Hernández Heredero, A Shabat, V Sokolov, “A new class of linearizable equations”, J. Phys. A: Math. Gen., 36, no. 47, 2003, L605
Dmitry Demskoi, “On application of Liouville type equations to constructing Bäcklund transformations”, JNMP, 14, no. 1, 2007, 147
Jan A Sanders, Jing Ping Wang, “On the integrability of systems of second order evolution equations with two components”, Journal of Differential Equations, 203, no. 1, 2004, 1
Martin Juráš, Ian M. Anderson, “Generalized Laplace invariants and the method of Darboux”, Duke Math. J., 89, no. 2, 1997
D. E. Baldwin, W. Hereman, “A symbolic algorithm for computing recursion operators of nonlinear partial differential equations”, International Journal of Computer Mathematics, 87, no. 5, 2010, 1094
A. Sergyeyev, “On the classification of conditionally integrable evolution systems in (1 + 1) dimensions”, J Math Sci, 136, no. 6, 2006, 4392
V. S. Novikov, E. V. Ferapontov, “On the classification of scalar evolutionary integrable equations in 2 + 1 dimensions”, Journal of Mathematical Physics, 52, no. 2, 2011, 023516
“Direct reduction and differential constraints”, Proc. R. Soc. Lond. A, 444, no. 1922, 1994, 509
Rafael Hernández Heredero, “Classification of Fully Nonlinear Integrable Evolution Equations of Third Order”, JNMP, 12, no. 4, 2005, 567
Handbook of Nonlinear Partial Differential Equations, Second Edition, 2011, 1795