Galstyan, Galstyan (1978),Acancʻumə ew acancʻnerə žamanakakicʻ hayerenum [Affixation and affixes in modern Armenian][1] (in Armenian), Yerevan: University Press,page132
Gočanean, Pōġos (2011),Dasakan grabari gorcnakan kʻerakanutʻiwn [Practical Grammar of Classical Old Armenian][2] (in Armenian), Vienna and Yerevan: Mekhitarist Press, page84
Godel, Robert (1975),An introduction to the study of classical Armenian, Wiesbaden: Dr. Ludwig Reichert Verlag, page66
J̌ahukyan, Geworg (1998), “-ի”, inHin hayereni verǰacancʻneri cagumə [The Origin of Old Armenian Suffixes] (Hayocʻ lezvi hamematakan kʻerakanutʻyan harcʻer; 2) (in Armenian), Yerevan: Anania Širakacʻi, pages5–48
The genitive/dative/locative marker fori-declension is identical with the-ի-(-i-) stem vowel. In Godel's words, the remaining stem, standing in contrast to the nominative/accusative singular (which lost its stem), was apt to function as a full-fledged case form. According to Godel, in the case of thei-a-declension we are dealing with a Proto-Armenian morphological innovation: the new morpheme was abstracted from the genitive/dative/locative case ending-ի(-i) ofi-stem nouns and applied toa-stem nouns, whose original endings had been lost.
