@article{10_4064_cm120_2_2,
     author = {Sch\^oichi \^Ota},
     title = {$q$-deformed circularity for an unbounded
 operator in {Hilbert} space},
     journal = {Colloquium Mathematicum},
     pages = {191--199},
     publisher = {mathdoc},
     volume = {120},
     number = {2},
     year = {2010},
     doi = {10.4064/cm120-2-2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm120-2-2/}
}