He has conducted research into Early Irish language and literature;
Irish folklore; the syntax, semantics and lexicon of Irish; and Celtic links with Nordic, Slavic and Germanic cultures.[2]
Mac Mathúna, S. (1985). Immram Brain: Bran's Journey to the Land of the Women[5]
Mac Mathúna, S. (1995). Collins Gem Irish Dictionary
Ó Corráin, A., & Mac Mathúna, S. (1997). Collins Pocket Irish Dictionary[6]
Mac Mathúna, S. (2007). On the Definite Article and Definite Descriptions in Irish[7]
Mac Mathúna, S., & Corrain, A. (eds) (1997). Miscellanea Celtica in Memoriam Heinrich Wagner[8]
Mac Mathúna, S. (2006). Parallels between Celtic and Slavic
Mac Mathúna, S. (2012). Ireland and Armenia: Studies in Language, History and Narrative
Borsje, M., Dooley, A., Mac Mathúna, S., & Toner. G. (eds) (2014). Celtic Cosmology. Perspectives from Ireland and Scotland. Toronto: Pontifical Institute of Mediaeval Studies.[9]
A Festschrift in his honour was presented to him on his 75th birthday and launched at the 17th International Symposium of Societas Celtologica Nordica held in Uppsala on 7–10 May 2020.[10]
^Mac Mathúna, Seamus (2021). Iceland and the Immrama: An Inquiry into Irish Influence on Old Norse-Icelandic Voyage Literature. Munchen: Herbert Utz Verlag.
ISBN9783831676781.
^"Mac Mathúna (Séamus)". Bibliography of Irish Linguistics and Literature School of Celtic Studies Dublin Institute for Advanced Studies. Retrieved 28 February 2022.
^Mac Mathúna, Séamus (1975). Immram Brain: Bran's Journey to the Land of the Women. Tubingen: M. Niemeyer. p. 510.
ISBN9783484400825.
^Ó Corráin, Ailbhe, Ó Corráin, Ailbhe; Mac Mathúna, Séámus, Mac Mathúna, Séámus (1997). Collins pocket Irish dictionary. London: HarperCollins. p. 640.
ISBN9780004707655.{{
cite book}}: CS1 maint: multiple names: authors list (
link)
^Mac Mathúna, Séamus (2007). On the definite article and definite descriptions in Irish. Moskva: Yaz'iky Slavyanskoyi Kul'tur'i. p. 44.
ISBN9785955102146.
^MacMathuna, Seamus; Corrain, Ailbhe (1997). Miscellanea Celtica Memoriam Henrich Wagner. London: Coronet Books. p. 366.
ISBN978-9155439514.
^Borsje, Jacqueline; Toner, Gregory; Dooley, Ann; Mac Mathúna, Séamus (2014). Celtic cosmology: perspectives from Ireland and Scotland. Toronto: Pontifical Institute of Mediaeval Studies. p. 315.
ISBN9780888448262.