@article{DAN_1968_179_4_a0,
     author = {I. A. Bakhtin},
     title = {On the problem of extending positive linear functionals},
     journal = {Doklady Akademii Nauk},
     pages = {759--761},
     publisher = {mathdoc},
     volume = {179},
     number = {4},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1968_179_4_a0/}
}