@article{MZ_1971__121_171561,
     author = {M. Glasner and R. Katz and M. Nakai},
     title = {Examples in the {Classification} {Theory} of {Riemannian} {Manifolds} and the {Equation} ...u = {Pu.}},
     journal = {Mathematische Zeitschrift},
     pages = {233--238},
     publisher = {mathdoc},
     volume = {121},
     year = {1971},
     zbl = {0213.12305},
     url = {http://geodesic.mathdoc.fr/item/MZ_1971__121_171561/}
}