N. Miyazaki, A REMARK ON THE MASLOV FORM ON THE GROUP GENERATED BY INVERTIBLE FOURIER INTEGRAL-OPERATORS, letters in mathematical physics, 42(1), 1997, pp. 35-41
On certain infinite-dimensional Lie groups, we define a closed 1-form
in the same way as the Maslov form, which is essentially described by
the complex determinant mapping defined in this Letter.