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@article{MZ_1981__178_173122, author = {Lieven Vanhecke}, title = {A {Conjecture} of {Besse} on {Harmonic} {Manifolds.}}, journal = {Mathematische Zeitschrift}, pages = {555--558}, publisher = {mathdoc}, volume = {178}, year = {1981}, zbl = {0465.53030}, url = {http://geodesic.mathdoc.fr/item/MZ_1981__178_173122/} }
Lieven Vanhecke. A Conjecture of Besse on Harmonic Manifolds.. Mathematische Zeitschrift, Tome 178 (1981), pp. 555-558. http://geodesic.mathdoc.fr/item/MZ_1981__178_173122/