References
Yan Shaozong, Unitary Operators on Space Π(I),Jour. Fudan Unvi.,20(1981), 424–432.
Yan Shaozong, Unitary Operators on Space Π(II),Ann. of Math. China, Ser. A 4 (1983), 207–216.
Yan Shaozong, Unitary Operators on Space Π(III),Acta Math. Sinica,25 (1982), 610–616.
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Projects Supported by the Science Fund of the Chinese Academy of Sciences.
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Shaozong, Y. Unitary operators on space Π. Acta Mathematica Sinica 2, 1–13 (1986). https://doi.org/10.1007/BF02568519
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DOI: https://doi.org/10.1007/BF02568519