1. Advanced Mathematical Methods for Scientists and Engineers;Bender,1978
2. Iteration of Rational Functions;Beardon,1991
3. Topological construction of transseries and introduction to generalized Borel summability;Costin,2009
4. On the formation of singularities of solutions of nonlinear differential systems in antistokes directions
5. Analytic methods for obstruction to integrability in discrete dynamical systems;Costin;Comm. Pure Appl. Math.,2005