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Тодор Бояджиев, Иван Куцаров, Йордан Пенчев (1999) “3. Морфемен състав на производната дума ”, in Тодор Бояджиев, editor, Съвременен български език (in Bulgarian) (textbook), Sofia, Bulgaria: ИК "Петър Берон", →ISBN, pages 240, 241
The first part of the compound is normally a noun or adjective, but sometimes a verb. In all cases its ending, back to the final consonant of the stem.
The second part of the compound is frequently a verb, in which case it also loses its ending, back to the final consonant of the stem, which is normally made hard if it is a paired soft consonant, with е becoming ё in the process, as in вертолёт(vertoljót, “helicopter”) and атомохо́д(atomoxód, “atomic-poweredvessel”) (but see also кругове́рть(krugovértʹ, “whirlwind”), where the final consonant remains soft). Compare similarly formed Latinate compounds such as aqueduct.
The interfix itself is never stressed, but the word preceding the interfix may in some cases have a secondary stress. If the stress of that word is on the stem, the secondary stress will generally be on the same syllable, but if the stress was on the lost ending, the last syllable of the stem will bear the secondary stress, e.g. бронеавтомоби́ль(broneavtomobílʹ) (stressed as бро̀неавтомоби́ль), from броня́(bronjá) + автомоби́ль(avtomobílʹ).