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1993 The conformal factor and a central extension of a formal loop group with values in ${\rm PSL}(2,{\bf R})$
Ryuichi Sawae
Hiroshima Math. J. 23(2): 249-303 (1993). DOI: 10.32917/hmj/1206128253
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Vol.23 • No. 2 • 1993
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