1. E. Abreu, H.S. Medeiros, Local behaviour and existence of solutions of the fractional (p, q)–Laplacian. Submitted paper, https://arxiv.org/abs/1812.01466.
2. V. Ambrosio, Concentration phenomena for critical fractional Schrödinger systems. Commun. Pure Appl. Anal. 17, No 5 (2018), 2085–2123.
3. V. Ambrosio, Fractional p&q Laplacian problems in ℝN with critical growth. To appear in: Z. Anal. Anwend., https://arxiv.org/abs/1801.10449.
4. V. Ambrosio, T. Isernia, On a fractional p&q Laplacian problem with critical Sobolev–Hardy exponents, Mediterr. J. Math. 15, No 6 (2018) Art. 219, pages 17.
5. V. Ambrosio, R. Servadei, Supercritical fractional Kirchhoff type problems. Fract. Calc. Appl. Anal. 22, No 5 (2019), 1351–1377; 10.1515/fca-2019-0071; https://www.degruyter.com/view/journals/fca/22/5/fca.22.issue-5.xml.