Search for and study of extremely metal-deficient galaxies

@article{Pustilnik2003SearchFA,
  title={Search for and study of extremely metal-deficient galaxies},
  author={Simon Pustilnik and A Y Kniazev and Alexander G. Pramskij and A. V. Ugryumov},
  journal={Astrophysics and Space Science},
  year={2003},
  volume={284},
  pages={795-798}
}
We summarize the progress in identifying and observational study of extremely metal-deficient (XMD) gas-rich galaxies (BCGs, dIr and LSBDs). Due to volume limitation only the following issues are addressed: sample creation, some statistical data, Colour-Magnitude Diagrams (CMD) and ages, the case of SBS 0335–052 system, and probable evolution paths of various XMD objects. 

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