Immonen, H.-M. ”Selective Fiscal Measures and the Definition of the Relevant Reference Framework in the Light of Cases C‑106/09 P, Commission v Gibraltar and C‑203/16 P, Heitkamp BauHolding v Commission”. Helsinki Law Review, vsk. 13, nro 2, helmikuuta 2020, ss. 64-75, doi:10.33344/vol13iss2pp64-75.