@article{10_4153_CJM_1992_069_3,
     author = {Bhatia, R. and Elsner, L.},
     title = {Symmetries and {Variation} of {Spectra}},
     journal = {Canadian journal of mathematics},
     pages = {1155--1166},
     year = {1992},
     volume = {44},
     number = {6},
     doi = {10.4153/CJM-1992-069-3},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1992-069-3/}
}