@article{SIGMA_2009_5_a4,
     author = {Ulrich D. Jentschura and Andrey Surzhykov and Jean Zinn-Justin},
     title = {Generalized {Nonanalytic} {Expansions,} $\mathcal{PT}${-Symmetry} and {Large-Order} {Formulas} for {Odd} {Anharmonic} {Oscillators}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2009},
     volume = {5},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2009_5_a4/}
}