@article{IM_1992__110_2_144038,
     author = {C. Gordon and D. Webb and S. Wolpert},
     title = {Isospectral plane domains and surfaces via {Riemannian} orbifolds.},
     journal = {Inventiones mathematicae},
     pages = {1--22},
     publisher = {mathdoc},
     volume = {110},
     number = {2},
     year = {1992},
     zbl = {0778.58068},
     url = {http://geodesic.mathdoc.fr/item/IM_1992__110_2_144038/}
}