@article{10_4007_annals_2005_161_1645,
     author = {Michael Eastwood},
     title = {Higher symmetries of the {Laplacian}},
     journal = {Annals of mathematics},
     pages = {1645--1665},
     publisher = {mathdoc},
     volume = {161},
     number = {3},
     year = {2005},
     doi = {10.4007/annals.2005.161.1645},
     mrnumber = {2180410},
     zbl = {1091.53020},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4007/annals.2005.161.1645/}
}