@misc{J._A._Siddiqi_On,
 author={J. A. Siddiqi},
 address={Երևան},
 howpublished={online},
 publisher={ՀՍՍՀ ԳԱ հրատ․},
 title={On the equivalence of classes of infinitely differentiable functions},
 type={Հոդված},
 keywords={Mathematics, Science},
}