TY - JOUR AU - Oleg Evnin TI - Breathing Modes, Quartic Nonlinearities and Effective Resonant Systems JO - Symmetry, integrability and geometry: methods and applications PY - 2020 VL - 16 UR - http://geodesic.mathdoc.fr/item/SIGMA_2020_16_a33/ LA - en ID - SIGMA_2020_16_a33 ER -