@article{DAN_1972_204_3_a7,
     author = {V. \`E. Lyantse},
     title = {On certain relations between closed operators},
     journal = {Doklady Akademii Nauk},
     pages = {542--545},
     publisher = {mathdoc},
     volume = {204},
     number = {3},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1972_204_3_a7/}
}