@article{AIHPC_2022__39_1_201_0,
     author = {Yu, Yifeng},
     title = {High degeneracy of effective {Hamiltonian} in two dimensions},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {201--223},
     volume = {39},
     number = {1},
     year = {2022},
     doi = {10.4171/aihpc/6},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/aihpc/6/}
}