@article{AFM_1993_18_2_a9,
     author = {Peter Ebenfelt},
     title = {Some results on the {Pompeiu} problem},
     journal = {Annales Fennici Mathematici},
     pages = {369--375},
     publisher = {mathdoc},
     volume = {18},
     number = {2},
     year = {1993},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AFM_1993_18_2_a9/}
}