@article{CMH_1980__55_139848,
     author = {C.A. Berenstein and L. Zalcman},
     title = {Pompeiu's problem on symmetric spaces.},
     journal = {Commentarii mathematici Helvetici},
     pages = {593--621},
     publisher = {mathdoc},
     volume = {55},
     year = {1980},
     zbl = {0452.43012},
     url = {http://geodesic.mathdoc.fr/item/CMH_1980__55_139848/}
}