@article{CRMATH_2003__336_7_611_0,
     author = {Stanislav Kupin},
     title = {On sum rules of special form for {Jacobi} matrices},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {611--614},
     publisher = {Elsevier},
     volume = {336},
     number = {7},
     year = {2003},
     doi = {10.1016/S1631-073X(03)00132-8},
     language = {en},
}