@misc{S._Kh._Darbinian_About,
 author={S. Kh. Darbinian and I. A. Karapetian},
 howpublished={online},
 publisher={Изд-во НАН РА},
 type={Հոդված},
 title={About 2-cyclic orgraph},
 keywords={Mathematics, Graph theory},
}