Mo, Xiao Huan et Sun, Fang, Bubble tree convergence for the harmonic sequence of harmonic surfaces in ..n, Acta mathematica Sinica. English series (Print) , 26(7), 2010, pp. 1277-1286
We show that any harmonic sequence determined by a harmonic map from a compact Riemannian surface M to ..n has a terminating holomorphic (or anti-holomorphic) map from M to ..n, or a .bubble tree limit. consisting of a harmonic map f^: M . ..n and a tree of bubbles h µ. : S 2 . ..n.