@article{Popey-ool2019the,
author={Popey-ool, S.K.},
title={The Theory of Self-Identification and Categorical Research Method},
journal={Scientific Research and Development. Socio-Humanitarian Research and Technology},
publisher={INFRA-M Academic Publishing LLC.},
year={2019},
pages={17-25},
volume={8},
issue={1},
}