Sario, Leo and Others <br/><br/>
Classification theory of Riemannian manifolds; harmonic, quasiharmonic and biharmonic functions   

 - Berlin  Springer-Verlag  1977 
 - xx, 498p. Index 
 - Lecture notes in Mathematics   605 .
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<br/><br/><label>Dewey Class. No.: </label>516  / Sa245.CT