Abstract
This article discusses some aspects of the formation of the morphological (or to put it more precisely morphemic) criterion in the procedures for establishing the phoneme inventory. Mainly it will be a matter of the St. Petersburg (Leningrad) School of phonology (alias the Ščerba School, or School of Ščerba) and the Moscow School, since both, while solving phonological problems, attach importance to the morphological data, though in different ways.

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