@article{IM_1980__57_142701,
     author = {Toshio Oshima and Jiro Sekiguchi},
     title = {Eigenspaces of {Invariant} {Differential} {Operators} on an {Affine} {Symmetric} {Space.}},
     journal = {Inventiones mathematicae},
     pages = {1--82},
     publisher = {mathdoc},
     volume = {57},
     year = {1980},
     zbl = {0434.58020},
     url = {http://geodesic.mathdoc.fr/item/IM_1980__57_142701/}
}