Antje Wendtland (2009), The position of the Pamir languages within East Iranian, Orientalia Suecana LVIII "The Pamir languages are a group of East Iranian languages which are linguistically quite diverse and
cannot be traced back to a common ancestor. The term Pamir languages is based on their geographical position rather than on their genetic closeness. Exclusive features by which the Pamir languages can be distinguished from all other East Iranian languages cannot be found either."
Nicholas Sims-Williams, Eastern Iranian languages, in Encyclopaedia Iranica, Online Edition, 2010. "The Modern Eastern Iranian languages are even more numerous and varied. Most of them are classified as North-Eastern: Ossetic; Yaghnobi (which derives from a dialect closely related to Sogdian); the Shughni group (Shughni, Roshani, Khufi, Bartangi, Roshorvi, Sarikoli), with which Yazghulyami (Sokolova 1967) and the now extinct Wanji (J. Payne in Schmitt, p. 420) are closely linked; Ishkashmi, Sanglichi, and Zebaki; Wakhi; Munji and Yidgha; and Pashto."
