@misc{Yuri_R._Hakopian_Algebraic,
 author={Yuri R. Hakopian},
 howpublished={online},
 publisher={Изд-во НАН РА},
 title={Algebraic multilevel/substructuring preconditioner in finite element method with piecewise quadratic approximation},
 type={Հոդված},
 keywords={Mathematics, Algebra},
}