1. Symmetry and Integration Methods for Differential Equations;Bluman,2002
2. Symmetries and Differential Equations;Bluman,1989
3. Lie point symmetries of the Lane–Emden systems;Bozhkov;J. Math. Anal. Appl.,2004
4. Special conformal groups of a Riemannian manifold and the Lie point symmetries of the nonlinear Poisson equations;Bozhkov;J. Differential Equations,2010
5. Lie symmetries and criticality of semilinear differential systems;Bozhkov;SIGMA Symmetry Integrability Geom. Methods Appl.,2007