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2. Elementary Lie group analysis and ordinary differential equations;Ibragimov,1999
3. Laplace type invariants for parabolic equations;Ibragimov;Nonlinear Dynam,2002
4. Differential invariants of nonlinear equations vtt=f(x,vx)vxx+g(x,vx);Ibragimov;Commun Nonlinear Sci Numer Simul,2004
5. Invariants for evolution equations;Ibragimov;Proc Inst Math NAS Ukraine,2004