Sario, L., Nakai, M., Wang, C., & Chung, L. O. (1977). Classification theory of Riemann manifolds: Harmonic, quasiharmonic and biharmonic functions. Springer-Verlag.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSario, Leo, Mitsuru Nakai, Cecilia Wang, और Lung Ock Chung. Classification Theory of Riemann Manifolds: Harmonic, Quasiharmonic and Biharmonic Functions. Berlín: Springer-Verlag, 1977.
एमएलए (9वां संस्करण) प्रशस्ति पत्रSario, Leo, et al. Classification Theory of Riemann Manifolds: Harmonic, Quasiharmonic and Biharmonic Functions. Springer-Verlag, 1977.
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