Challenges and possibilities of enforcing the rule of Law within the EU constitutional edifice - the need for increased role of court of justice, EU charter and diagonality in perceptionHamulak, Ondrej; Circolo, AndreaThe EU in the 21st century : challenges and opportunities for the European integration process2020 / p. 155-169 https://doi.org/10.1007/978-3-030-38399-2_10

Euratom and Brexit : could the United Kingdom maintain one foot in the European Union? Current scenarios and future prospects of British withdrawal from the EAECCircolo, Andrea; Hamulak, OndrejInternational and comparative law review2018 / p. 134–151 https://doi.org/10.2478/iclr-2018-0042

The principle of solidarity between voluntary commitment and legal constraint : Comments on the judgment of the Court of Justice of the European Union in joined cases C-643/15 and C-647/15Circolo, Andrea; Hamulak, Ondrej; Lysina, PeterCzech Yearbook of Public & Private International Law2018 / p. 155–173 https://rozkotova.cld.bz/CYIL-vol-9-2018/174/