1. Abdellaoui, B., Peral, I., Primo, A.: A remark on the fractional Hardy inequality with a remainder term. C. R. Math. Acad. Sci. Paris 352, 299–303 (2014)
2. C. O. Alves and O. H. Miyagaki, Existence and concentration of solution for a class of fractional elliptic equation in
$$\mathbb{R}^{N}$$ via penalization method, Calc. Var. Partial Differential Equations, 55 (2016), pp. Art. 47, 19
3. Ambrosetti, A., Rabinowitz, P.H.: Dual variational methods in critical point theory and applications. J. Functional Analysis 14, 349–381 (1973)
4. B. Barrios, M. Medina, and I. Peral, Some remarks on the solvability of nonlocal elliptic problems with the Hardy potential, Commun. Contemp. Math., 16 (2014), pp. 1350046, 29
5. L. Brasco, S. Mosconi, and M. Squassina, Optimal decay of extremals for the fractional Sobolev inequality, Calc. Var. Partial Differential Equations, 55 (2016), pp. Art. 23, 32