 For a long time there have been investigators who believe that the number of loanwords from Iranian languages in Proto-Slavic is substantial.For example, Gołąb (1992) maintains that all Slavic words with unexplained initial *"x"- are in fact Iranianisms.However, there have been other Slavists who have claimed that confirmed Iranianisms in Slavic are in fact surprisingly few, and Matasović has raised broad objections to the body of past Iranianist research.