@misc{H._M._Tovmassian_On,
 author={H. M. Tovmassian and R. A. Sramek},
 address={Երևան},
 howpublished={online},
 publisher={ՀՍՍՀ ԳԱ հրատ․},
 title={On the nature of NGC 520},
 type={Հոդված},
 keywords={Science, Astrophysics, Galaxy},
}