@misc{R._A._Vardanian_On,
 author={R. A. Vardanian},
 address={Երևան},
 howpublished={online},
 publisher={ՀՀ ԳԱԱ հրատ.},
 title={On the duplicity of cool giant and supergiant variable stars},
 type={Հոդված},
 keywords={Science, Astrophysics, Stars},
}