@misc{H._S._Hovhannisyan_Echocardiographic,
 author={H. S. Hovhannisyan},
 address={Երևան},
 howpublished={online},
 publisher={Հայաստանի ԳԱԱ},
 type={Հոդված},
 title={Echocardiographic characteristics of patients with rheumatoid arthritis},
 keywords={Cardiology, Medicine},
}