@article{10_21136_CMJ_1973_101139,
     author = {Singer, Ivan},
     title = {On minimal sequences of type $l_+$ and bounded biorthogonal systems in {Banach} spaces},
     journal = {Czechoslovak Mathematical Journal},
     pages = {11--14},
     publisher = {mathdoc},
     volume = {23},
     number = {1},
     year = {1973},
     doi = {10.21136/CMJ.1973.101139},
     mrnumber = {0317013},
     zbl = {0273.46010},
     language = {en},
     url = {https://geodesic-test.mathdoc.fr/articles/10.21136/CMJ.1973.101139/}
}