@article{MOMA_1963__67_177193,
     author = {Ali R. Amir-Mo\'ez},
     title = {Properties of {Certain} {Sets} in {Unitary} {Spaces.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {1--6},
     publisher = {mathdoc},
     volume = {67},
     year = {1963},
     zbl = {0107.37905},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1963__67_177193/}
}