Geodesic
Strange Phenomena Related to Ordering Problems in Quantizations
Journal of Lie theory, Tome 13 (2003) no. 2, pp. 481-51.

Voir la notice de l'article provenant de la source Heldermann Verlag

We introduce an object which in a sense extends the notion of a covering space. Such an object is required to understand the "group" generated by the exponential functions of quadratic forms in the Weyl algebra, and gives in some sense a complexification of the metaplectic group. 
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     author = {H. Omori and Y. Maeda and N. Miyazaki and A. Yoshioka },
     title = {Strange {Phenomena} {Related} to {Ordering} {Problems} in {Quantizations}},
     journal = {Journal of Lie theory},
     pages = {481--51},
     publisher = {mathdoc},
     volume = {13},
     number = {2},
     year = {2003},
     url = {http://geodesic.mathdoc.fr/item/JLT_2003_13_2_JLT_2003_13_2_a10/}
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H. Omori; Y. Maeda; N. Miyazaki; A. Yoshioka . Strange Phenomena Related to Ordering Problems in Quantizations. Journal of Lie theory, Tome 13 (2003) no. 2, pp. 481-51. http://geodesic.mathdoc.fr/item/JLT_2003_13_2_JLT_2003_13_2_a10/