Sine-Laplace equation, sink - Laplace equation and harmonic maps
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Tài liệu tham khảo
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Gu, C.H.: On the Harmonic Maps from R1,1 to S1,1. to appear
Chern, S.S.: Geometrical Interpretation of Sinh ? Gordon Equations. Annales Polinici Math.39, 63?69 (1981)
Courant, R. and Hilbert, D.: Methods of Mathematical Physics, vol II, 369?374 Interscience Publishers, (1966)