  In this paper we study the asymptotic behavior of least energy solutions and
the existence of multiple bubbling solutions of nonlinear elliptic equations
involving the fractional Laplacians and the critical exponents. This work can
be seen as a nonlocal analog of the results of Han (Ann. Inst. H. Poincare
Anal. Non Lineaire, 1991) and Rey (J. Funct. Anal., 1990).
