TY - JOUR AU - Ulrich D. Jentschura AU - Andrey Surzhykov AU - Jean Zinn-Justin TI - Generalized Nonanalytic Expansions, $\mathcal{PT}$-Symmetry and Large-Order Formulas for Odd Anharmonic Oscillators JO - Symmetry, integrability and geometry: methods and applications PY - 2009 VL - 5 UR - http://geodesic.mathdoc.fr/item/SIGMA_2009_5_a4/ LA - en ID - SIGMA_2009_5_a4 ER -