no. 3
Symmetric subspaces related to certain eigenvalue problems
Compositio Mathematica, Tome 26 (1973) no. 3, pp. 233-247 
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     author = {Dijksma, A. and de Snoo, H. S. V.},
     title = {Symmetric subspaces related to certain eigenvalue problems},
     journal = {Compositio Mathematica},
     pages = {233--247},
     year = {1973},
     publisher = {Noordhoff International Publishing},
     volume = {26},
     number = {3},
     mrnumber = {344928},
     zbl = {0265.47022},
     language = {en},
     url = {https://www.numdam.org/item/CM_1973__26_3_233_0/}
}
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Dijksma, A.; de Snoo, H. S. V. Symmetric subspaces related to certain eigenvalue problems. Compositio Mathematica, Tome 26 (1973) no. 3, pp. 233-247. https://www.numdam.org/item/CM_1973__26_3_233_0/

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