@misc{G._Welin_Spectral,
 author={G. Welin},
 address={Երևան},
 howpublished={online},
 publisher={ՀՍՍՀ ԳԱ հրատ․},
 title={Spectral classifications of emission-line stars},
 type={Հոդված},
 keywords={Astrophysics, Science, Stars},
}