The foundation of any modern research is the theoretical base built by researchers who previously studied or currently studying a selected field.
The research topic we have chosen — Particles in Russian, English, and German — indicates the need to study the theory of parts of speech in a contrastive-typological aspect. In this regard, the classical studies of parts of speech in compared languages have become many reference points.
Since approaches to the study of particles vary significantly from researcher to researcher, from one research paradigm to the other, there is a need for constant updating of the list of references and constant work and interaction with particle researchers. At the moment, we have proposed a “basic” list of sources, which can serve as a starting point for the study of particles in compared languages. This list is available on the cloud data website of a research project and is available for editing. However, taking into account the complexity of the issue under study, this list is not finite and is subject to constant updating.