Vrana, V.: Roman diplomacy in ancient Rome. In: Glossa Iuridica. - ISSN 2064-6887. - Roč. 8, č. 3 Trianon (2021), s. 123-140.

Vrana, V. Rímsko-právny rozmer pôžičky alebo úžery a nútený výkon rozhodnutia. In: Pôžička či úžera? Nútený výkon rozhodnutia - historickoprávne základy. - Košice : Univerzita Pavla Jozefa Šafárika v Košiciach, 2019. - ISBN 9788081527913. - S. 8-71.

Vrana, V. Dichotómia rímskeho práva a postoj vybraných neskoroklasických rímskych právnikov. In: Historia et theoria iuris : printový a e-časopis pre mladých vedeckých pracovníkov právnických fakúlt na Slovensku : teoretický časopis pre otázky štátu a práva. - ISSN 1338-0133. - Roč. 11, (2019), s. 13-23.

Vrana, V. Niekoľko poznámok k nájomnej zmluve v rímskom práve. In: Školy, osobnosti, polemiky : pocta Ladislavu Vojáčkovi k 65. narozeninám. - Brno : Evropská společnosť pro právní dějiny, 2017. - ISBN 9788087475515. - S. 568-595.

Vrana, V. Praefectus annonae. In: Ius Honorarium - římské magistratury a jejich činnost. - Brno : Masarykova univerzita, 2019. - ISBN 9788021094475. - S. 118-131.

VEGA 1/0198/17 The loan or usury? Compulsory enforcement of judgment - historical and law foundations and problems of application practice, 01/2017-12/2019, co-worker

The project aims on law and historical specifications of genealogy of compulsory enforcement of judgment and actual development tendencies in following purviews:

• legal regulations of real contract of “classical” loan and its differentiation basis for issue of later execution title, condemnation decision and its procedural “pendant” – in case of debtor’s non-performance of obligation or decision of condemned - compulsory enforcement of judgment through applying distraint actions of the creditor during the classical and Justinian roman law relying on the exegesis of the original sources of roman law
• legal history with emphasis on legislation of the Hungarian law in the legal customs and laws, while accentuates the process of creation of dual system of private law in the 19th century and development of the legal system in ČSR until 1950
• present state based on the current legislation of contracts that are substantive precondition of execution, as well as procedural provisions and their development trends

APVV-19-0419 100 years of Trianon treaty, 07/2020-06/2024, co-worker

Treaty of Trianon is one of the most problematic treaties of the Versailles peace system, rising different emotions on the both sides of the Danube during 100 years of being in force. Pride of one sown state that the treaty has helped to build on the one side, dissappointment and disillusion on the other. Rising international cooperation of Slovak, Hungarian and Polish legal scientists will aspire to change the stated status by revising the Treaty of Trianon excactly after 100 years of its signing in respect of it´s significance to the region of Central Europe as their primary goal. Treaty of Trianon hasn’t been analyzed in detail and comprehensively examined by legal scientists yet, there for legal historians, romanists as well as positive lawyers will take part in there a search in order to examine the Treaty mostly in aspects of public law, not neglecting private law consequences as well. While the primary objective of there as earch remains scientific, the ambition of the participants also excedesin to achieving consensus in a mater deeply controversional over 100 years mostly between Slovak and Hungarian colleagues. The results of there search will not only beutilised in the pedagogical proces s, but also in the praxis of Historian society in Košice.