TY - RPRT TI - Finding a nonlinear lattice with improved integrability using Lie transform perturbation theory. AU - Kiran G Sonnad AU - John R Cary PY - 2004 DO - 10.1103/physreve.69.056501 UR - https://pubmed.ncbi.nlm.nih.gov/15244955/ ID - 15244955 ER -