@article{MAN_1973__201_162367,
     author = {Ivan Singer},
     title = {On {Biorthogonal} {Systems} and {Total} {Sequences} of {Functionals.} {II.}},
     journal = {Mathematische Annalen},
     pages = {1--8},
     publisher = {mathdoc},
     volume = {201},
     year = {1973},
     zbl = {0233.46028},
     url = {http://geodesic.mathdoc.fr/item/MAN_1973__201_162367/}
}