Fractional eigenvalue problems that approximate Steklov eigenvalues
  In this paper we analyze possible extensions of the classical Steklov eigenvalue problem to the fractional setting. In particular, we find a nonlocal eigenvalue problem of fractional type that approximate, when taking a suitable limit, the classical Steklov eigenvalue problem. 
Leandro M. Del Pezzo, Julio D. Rossi, Ariel M. Salort
math.AP