@article{10_4153_CMB_2006_023_7,
     author = {Engman, Martin},
     title = {The {Spectrum} and {Isometric} {Embeddings} of {Surfaces} of {Revolution}},
     journal = {Canadian mathematical bulletin},
     pages = {226--236},
     year = {2006},
     volume = {49},
     number = {2},
     doi = {10.4153/CMB-2006-023-7},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-2006-023-7/}
}